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One of the easiest ways to spot a smart person is by hearing them say, “I don’t know.” It’s a powerful phrase that shows humility, curiosity, and a willingness to learn. But, as you’ve probably seen in your own life (or online), these words aren’t in everyone’s vocabulary.

To show you what stubbornness can lead to, we’ve collected a list of moments where people were absolutely sure of themselves… and completely wrong at the same time—proof that confidence can take you far, just not always in the right direction.

#1

Widow ≠ Spinster

Screenshot of a social media post showing a mansplaining moment, highlighting people being 100% sure and 100% wrong.

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Colleen Glim
Community Member
6 months ago

I can feel myself losing IQ points with every post. No wonder the planet is going to hell in a handbasket

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    #2

    Question

    Social media post questioning meteors as falling objects on a flat Earth, showing wrong beliefs and comments.

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    ƒιѕн
    Community Member
    6 months ago

    Ahh, them pesky rocks falling from the flatmoshere

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    #3

    Your Parents Failed You

    A social media post incorrectly criticizing public school parenting followed by comments correcting grammar mistakes.

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    Intangible Panda
    Community Member
    6 months ago

    OMG...

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    #4

    Wireless PC's Don't Exist

    Reddit post from r/Showerthoughts where someone is sure wireless PCs do not exist but is proven wrong with a laptop example.

    dimerocks Report

    Abel
    Community Member
    6 months ago

    WIFI Black Magic!

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    #5

    Guess It’s Time To Buy A Globe!

    Screenshot of a social media thread showing people confidently wrong about Spanish and Dutch origin, illustrating graduation misunderstandings.

    ThePhantomThiefArc Report

    Intangible Panda
    Community Member
    6 months ago

    Oh boy...

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    #6

    Millipedes Are Not Insects, Frogs Are Not Reptiles, Arthropods, Reptiles, Amphibians Are All Animals

    Comment thread showing someone confidently wrong about animal classification, fitting the theme of being 100% sure and 100% wrong.

    reddit.com Report

    BeesEelsAndPups
    Community Member
    6 months ago

    Millipedes are amphibians and frogs are plants. Plants are bears. Obviously

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    #7

    America Is The Reason You Have Cars

    Comment thread where one user claims America invented cars and another confidently replies that it was Germany, showing being sure but wrong.

    LazyFlamingRooster Report

    Spencers slave no more
    Community Member
    6 months ago

    Germany invented cars, followed by Frank and Charles Dureya in 1893, 3 years later in the US. Ford followed in 1903, introducing mass produced cars.

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    #8

    Three In A Row! You Can’t Make This Up

    Greenland shark in the ocean with users debating its age, a perfect example of being sure and wrong at the same time.

    oddlygorgeous Report

    Karl der Große
    Community Member
    6 months ago

    Can somebody figure out where the 2030 number comes from? (PS-the three main Pyramids of Giza are over 4000 years old.)

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    #9

    For The Local People $1 Is A Lot Of Money

    Tips left in US dollars in Greece where the currency is euros, showing a common currency mistake.

    ALazy_Cat Report

    R Dennis
    Community Member
    6 months ago

    When I travel, I carry a debit card, a travel credit card, U.S. currency, and the local currency for every country I visit. I use the credit card for most expenses and only use local currency in emergencies or where cards aren't accepted.

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    #10

    Blood Nearlyboiling But Heart Rate Normal

    Screenshot of a test question estimating heart rate with answer 0 bpm, highlighting people sure but 100% wrong.

    luigi517 Report

    Lawpanda
    Community Member
    6 months ago

    98.7°C is 209.66°F little bit d**d if that is your body temperature.

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    #11

    On The Topic Of Exoplanets

    Screenshot of a social media thread where people are 100% sure and 100% wrong about space facts and moon landings.

    OkaTeluguAbbayi Report

    BeesEelsAndPups
    Community Member
    6 months ago

    YT?

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    #12

    What's Trinity?

    Twitter thread showing a debate about the meaning of the word trinity, illustrating people sure but wrong moments.

    ThePhantomThiefArc Report

    BeesEelsAndPups
    Community Member
    6 months ago

    I love the statement "don't always believe prefixes"

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    #13

    “Spanish Is A Language - People Aren’t Spanish”

    Screenshot of a social media comment humorously showing people 100% sure but 100% wrong about language facts.

    Power-C-Lies Report

    BeesEelsAndPups
    Community Member
    6 months ago

    Fair enough, I'll let the people of Catalán know they are free from their Castilian overlords

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    #14

    Girl…

    Social media post showing tsunami watch after Russia earthquake, with a comment questioning earthquake effects on Hawaii, graduation fail.

    whoaaintitfun Report

    Colleen Glim
    Community Member
    6 months ago

    Somebody missed the physics portion of science class

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    #15

    I Say Let Them Do The Swim!

    Map showing stretch between Argentina and Antarctica with comments disputing swim distance, highlighting being 100 percent sure and wrong.

    romeovf Report

    Colleen Glim
    Community Member
    6 months ago

    That particular bit of water is called the Drake passage. It’s known for severe storms and enormous waves. You want to try swimming it, go ahead. Just make sure your affairs are in order first

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    Never miss a story that brings joy to the world. Add us on Google

    #16

    The Reasons We Can't Have Nice Things

    Comment claiming solar and wind energy are too expensive and harmful, a clear example of being sure but wrong.

    hummvee69 Report

    Otorgar
    Community Member
    6 months ago

    Oh boy.

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    #17

    Guy Thinks Female Reindeer Dont Have Antlers

    Social media post debunking the myth about male and female reindeer antlers in winter with factual corrections.

    nerdgurl196305 Report

    UKGrandad
    Community Member
    6 months ago

    Yet another data point to my theory that any comment beginning 'umm' can be safely ignored.

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    #18

    They Continue On Saying That The Earth Is Around 6,000 Years Old, "According To The Bible"

    Social media conversation showing people sure but wrong about Earth's age and biblical interpretation debates.

    Ill-Key1438 Report

    Colleen Glim
    Community Member
    6 months ago

    Creationists are a “special” kind of people

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    #19

    That Is Biologically Incorrect

    Family photo of diverse parents and children outdoors illustrating moments people were sure and wrong simultaneously

    ClayMitchell Report

    Ye Olde Dirty Grumpy
    Community Member
    6 months ago

    Dave Bautista has choice words for homophobes

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    #20

    There Are No Replicas Of The Statue Of Liberty, So This Is AI

    Comment thread about misunderstanding a statue replica, showing people unsure and wrong about the real Statue of Liberty size and details.

    doppiojohn Report

    Remi (He/Him)
    Community Member
    6 months ago

    The one in France and the one in Norway made at the same time as the original are the first replicas that come to mind

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    #21

    On A Post About Not Receiving Medical Attention Prior To Giving Birth

    Comments showing people were 100% sure about homebirth safety but proven 100% wrong in NICU nurse discussion

    penguinpants1993 Report

    Colleen Glim
    Community Member
    6 months ago

    So all of the mothers and babies that died throughout history did so because the mothers were “in fear or not deeply aware of the process?” How did you survive to adulthood being that stupid?

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    #22

    Guy Thinks Incel Means "Introverted Celibate" And Corrects People Who Think Otherwise

    Reddit post humorously mistaking the identity of incel as excel, showing common people sure and wrong moments.

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    Spidercat
    Community Member
    6 months ago

    Bro identifies as a spreadsheet...

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    #23

    "2nd Grade Science" Indeed

    Social media post humorously showing a science misconception about ocean levels, highlighting people being sure but wrong.

    foogama Report

    WindySwede
    Community Member
    6 months ago

    Landice!!!

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    #24

    I Don't Think So

    Screenshot of a social media comment thread where users are 100% sure but 100% wrong about Germany and Austria.

    Jimm144 Report

    UKGrandad
    Community Member
    6 months ago

    There was a very famous Austrian in Germany; it didn't end well!

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    #25

    The Problem With Kids Nowadays

    Social media post discussing parenting time with children backed by a chart, illustrating 61 times people were sure but wrong.

    Biscuitarian23 Report

    les
    Community Member
    6 months ago

    shouldn't the school age number be much higher? i mean they dont go the school alone

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    #26

    This Comment

    Social media comments discussing misconceptions about sponges made of plastic fibers, highlighting people being 100% sure and wrong.

    Indie_Dragon-897 Report

    Geoffrey Scott
    Community Member
    6 months ago

    Tarpon Springs Fl would like a word..

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    #27

    '23 Stands For The Month'

    Social media comments showing confusion about dates and months, highlighting moments people were sure but wrong.

    Huge-Mortgage-2202 Report

    Nea
    Community Member
    6 months ago

    “Go school”

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    #28

    Everything You Said Is Incorrect

    Screenshot of a social media post showing someone confidently sharing a misguided opinion about national park signs.

    crowpierrot Report

    Nea
    Community Member
    6 months ago

    Sometimes I wish I was that simple in my head.

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    #29

    Learn Grammar

    Screenshot of an online argument where one user confidently corrects another and is proven wrong, illustrating common mistakes.

    everythingistakn Report

    Lawpanda
    Community Member
    6 months ago

    I'm just astounded.

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    #30

    I Don't Even Know What To Say

    Reddit thread showing users being sure they graduated English but making grammar mistakes and arguments.

    reddit.com Report

    Mrreoww
    Community Member
    6 months ago

    I’m not even from a primarily English-speaking country and people here probably are better at English.

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    #31

    Monotremes Are Not Mammals, Apparently. Found On Youtube Under A Short About The Evolution Of Horses

    Online discussion with people confidently wrong about platypus facts, illustrating common mistakes and fact-checking errors.

    CopperheadSlinger Report

    WindySwede
    Community Member
    6 months ago

    OK, I came to think of this...

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    #32

    Sorry But We *absolutely* Stopped The School Day And Watched It By Satellite

    Social media post debunking the false memory of schools forcing students to watch the shuttle explosion live.

    ExplorationGeo Report

    Razill
    Community Member
    Premium
    6 months ago

    I absolutely remember watching that in school. It was a group of 3 classroom that were normally separated by the collapsible walls that were opened so all rooms could see the very small TV on a roll cart. It was planned as a learning eperience to participate in over the time the astronauts were in space so it was quite a disruption when the launch failed.

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    #33

    Tesla Getting Clapped By Grok

    Twitter thread discussing Tesla safety ratings versus criticism about mortality rates with data and user comments.

    SpreadsheetMadman Report

    Colleen Glim
    Community Member
    6 months ago

    You couldn’t pay me enough to get one

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    #34

    The Only Time Genghis Was White Was When He Was Played By John Wayne

    Screenshot of a social media comment showing someone being 100% sure but 100% wrong about Genghis Khan’s ethnicity.

    laybs1 Report

    Lady Eowyn
    Community Member
    6 months ago

    Mongolified?

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    #35

    Watches A Clip From A Legal Drama, Thinks It’s Real

    Comment thread showing people sure about a courtroom scene, with one user clarifying it is a TV show, illustrating being 100% wrong.

    DTPVH Report

    Sparky
    Community Member
    6 months ago

    How do we know it's a legal drama? There's no way to tell from this.

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    #36

    Didn't Know They Had Coyotes In London!

    Screenshot of a social media thread where people are sure but wrong about animal species in London.

    wj56f Report

    Lady Eowyn
    Community Member
    6 months ago

    There is a London in Canada, that's North America.

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    #37

    That Is Your Opinion. You’re Entitled To It But It’s Also Completely Medically Incorrect

    Screenshot of social media comments showing people being 100% sure but 100% wrong, related to graduation doubts.

    cranialbone Report

    Colleen Glim
    Community Member
    6 months ago

    Schizophrenia is now a kidney issue requiring dialysis? Has anybody told the schizophrenics or the doctors yet?

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    #38

    Pluto Was Not Physically Removed From The Solar System

    Screenshot of a social media poll about Pluto's solar system status with users 100% sure but 100% wrong.

    GarbledReverie Report

    Mrreoww
    Community Member
    6 months ago

    “Removed from the solar system”? Pluto was just declared as not a proper planet anymore.

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    #39

    Red Has Clearly Never Set Foot On A Farm

    Farmers market 2025 cartoon showing workers holding signs for seasonal jobs, highlighting wrong assumptions about labor needs.

    PirateJohn75 Report

    Owen
    Community Member
    Premium
    6 months ago (edited)

    There's a lot of 'I know this for sure because I just guessed.' on this list.

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    #40

    Fourteenth Amendment

    Tweet discussion about the 14th Amendment definition of person, illustrating people being 100% sure and 100% wrong.

    N1KOBARonReddit Report

    Lady Eowyn
    Community Member
    6 months ago

    Oy vey.

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    #41

    Vitamin D

    Online discussion where people are 100% sure but 100% wrong about vitamin D sources and facts.

    AshesFallin Report

    UKGrandad
    Community Member
    6 months ago

    I mean, technically we don't get vitamin D from the sun. It's not as though the sun is sending streams of vitamin D molecules into the atmosphere. It's the UVB radiation in sunlight that triggers our bodies to produce vitamin D.

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    #42

    Some Guy Thinks That CGI And AI Are The Same (Many More Corrections Were Attempted)

    Comments thread showing people 100 percent sure and wrong, confusing CGI and AI in a humorous online discussion.

    Ms-Infinity0803 Report

    Doug Moyer
    Community Member
    6 months ago

    They are increasingly overlapping...

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    #43

    Playing Fast And Loose

    Reddit thread showing users confident in spelling but 100% wrong, illustrating moments people were sure yet mistaken.

    miss_archivist Report

    UKGrandad
    Community Member
    6 months ago

    Well, yes, 'looser' is a valid spelling, just not for a word describing one who loses.

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    #44

    Guy Thinks Iphones Don't Have Bluetooth

    Online comments showing people 100% sure and 100% wrong about smartphones and technology in a humorous discussion thread.

    Working-Ad-7415 Report

    Gail Lott
    Community Member
    Premium
    6 months ago

    Shhh… don’t tell my iPhone that it doesn’t have Bluetooth. It apparently doesn’t know.

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    #45

    Neanderthals Are Not Real

    Social media exchange showing people 100% sure and 100% wrong about Neanderthal existence evidence.

    daintyanemoney Report

    Phantom Phoenix
    Community Member
    Premium
    6 months ago (edited)

    Pffft! In my opinion your evidence of evidence doesn't count as evidence, so evidently, there's no evidence that you have any evidence of the evidence of Neanderthals. So there! /s

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    #46

    Think Critically

    Twitter exchange about misconceptions showing people were 100% sure and 100% wrong at the same time in a discussion.

    Yunners Report

    Ace
    Community Member
    Premium
    6 months ago

    "Do some research" is a sure sign of someone who's losing, no sorry, already lost, an argument.

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    #47

    Guy Thinks Gravity Is Biased (I’m Confused If He’s Fighting For Or Against Flat Earth)

    Social media comments debating gravity and flat world theory, showing people 100% sure and 100% wrong at the same time.

    Even_Ganache3329 Report

    Wren
    Community Member
    6 months ago

    Gravity is just one of many scientific principles that becomes irrelevant to people of a certain....denseness....

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    #48

    “Samurai Were Monks”

    Screenshot of a social media comment thread showing people 100% sure but wrong about samurai being warrior monks.

    SuspiciousSmilez Report

    Spidercat
    Community Member
    6 months ago

    He's confused Samurai with Crusaders...

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    #49

    Every Comment This Person Made Was As Completely Wrong As This One, Including The Several Other Times They Confidently Insisted 0 Isn't A Multiple Of 5

    Screenshot of an online debate where someone is 100% sure but wrong about zero being a multiple of five in math discussion.

    gmalivuk Report

    Intangible Panda
    Community Member
    6 months ago

    Their math is not mathing

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    #50

    Two People Confidently And Incorrectly Correcting The Dictionary

    Screenshot of a Twitter thread showing a funny conversation about language mistakes and people being 100% sure and 100% wrong.

    HeartSoft_ Report

    Dave Nalesnik
    Community Member
    6 months ago

    Derp derps*

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    #51

    Genuinely One Of The Biggest Whiffs I've Seen

    Screenshot of a social media post showing a logic puzzle and a user’s confident but flawed answer about pills on a deserted island.

    rkaminky Report

    Spidercat
    Community Member
    6 months ago

    Crush all four pills into a single pile of powder and mix it together. Then seperate the pile into two equal halves and take one half, which can all be done by touch alone...

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    #52

    Math Does Not Check Out

    Online discussion showing people confused about historical year calculations, illustrating moments of being sure but wrong.

    Vhexer Report

    UKGrandad
    Community Member
    6 months ago (edited)

    Lilac almost has it right. 1800BCE to 1000BCE (because we go from oldest to newest) was circa 3800 to 3000 years ago.

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    #53

    I Think The Word You Are Looking For Is Colonizers

    Woman wearing glasses and red shirt explaining the difference between settlers and immigrants, highlighting being sure but wrong.

    Leather-Bug3087 Report

    Thomas
    Community Member
    6 months ago

    Well, the natives didn't really consider it a country, maybe that's the logical process here?

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    #54

    He Didn't Do His Research

    Alt text: Bold text meme about Fight Club satire and male fragility, with social media reactions on a dark purple background.

    ElfOverlord Report

    Colleen Glim
    Community Member
    6 months ago

    Whoosh

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    #55

    “USA Is Number 1”

    Reddit users debating the origin of a video game, showing moments of being 100% sure and 100% wrong in comments.

    BuffaloExotic Report

    Owen
    Community Member
    Premium
    6 months ago

    PlayStation. Made in China by a Japanese company.

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    #56

    Dejected Because They Don't Know The Difference Between Lbs And Kg

    Plastic container of green grapes on a scale weighing over 1 lb, contrasting with 2 lb sale price at grocery store, showing mistaken assumptions.

    NoviceNotices Report

    Don Adams
    Community Member
    6 months ago

    Looks like the scale is set on kilograms. 1 kg is approximately 2.2 pounds

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    #57

    Time Is Hard

    Comment confidently explaining the change from PM to AM times, yet being 100% wrong and sure.

    fallriver1221 Report

    UKGrandad
    Community Member
    6 months ago (edited)

    AM - ante meridiem - before mid-day. PM - post meridiem - after mid-day. EDIT: It just occurred to me that the OP probably thinks AM/PM means 'after midnight / pre-midnight.

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    #58

    “Um, Actually Pride Month Is July”

    Online discussion where users confidently confuse June as July, illustrating moments people were 100% sure and 100% wrong.

    ExtensionAntique Report

    Sparky
    Community Member
    6 months ago

    What?

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    #59

    Nobody Could Ever Have 1.5tb Of RAM?!?

    Screenshot of online argument about 1.5TB of RAM, showing people sure but wrong about computer memory and hardware facts.

    olly1999 Report

    Doug Moyer
    Community Member
    6 months ago

    I would like 1.5tb of RAM, please. I only 16gb on this laptop and it is SLOW!!!

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    #60

    How Ironic Is The Group Name. Op Got Roasted In The Comments, Then Dirty Deleted

    Woman humorously correcting a doughnut price, showing a moment of being 100% sure and 100% wrong at the same time.

    Weekly_Airport_9046 Report

    Doug Moyer
    Community Member
    6 months ago

    For anyone here that is bad at math, the 5 donut price is 90 pence each, while the 8 donut price is 87.5 pence each.

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    #61

    Less Uninsignificant

    Alt text: Online comments showing doubts and opinions about news, illustrating moments people were sure and wrong.

    DifferentYoungUrine Report

    Mrreoww
    Community Member
    6 months ago

    This comment has been deleted.

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