Grew up in a house with a female cat that had been around since my siblings and I were little. She would use combinations of trills and meows to make cat approximations of our names that were close enough that we knew when she was calling a specific sibling.

If we didn't respond or start coming downstairs when my mother would call us from downstairs the cat would post up at the bottom of the stairs trill-meowing the person's name or come into their room and do it in their face until they followed.

Seemed perfectly normal to us but I had friends that were definitely creeped out by my cat "saying" my name.

My old cat Minos, over the course of a few days arranged “gifts for the family” among the bushes in our front yard. 3 mice were arranged in a line in the back row with all their heads facing north and 4 rats were arranged in a line in the front row with their heads facing south. One of the weirdest things I’ve ever had to clean up.

I did a little time. I ran into a guy in there that engineered a fight between three unrelated parties. That part wasn't the creepy part (though, good enough, really - two of the three fighting parties were *not* fighting people and he got 'em in the mix effortlessly). The creepy part was that in the roughly one minute before the fight kicked off (resulting in the block being locked down for three days, btw) he explained to me point by point and in close detail what the administrational response would be, exactly who would be involved, who would be written up, injured, reassigned to different blocks, etc. He did this so that a fourth party, not involved in the violence, would be caught up in cell searches with contraband, which happened. A tattoo kit. That guy left the block with the three fighters but never came back.

He told me all of this stuff point by point like a grocery list. Down to which guards would come and what their moods and reactions would be. He was in the cell next to mine and he just kept laying it out right until they locked us in.

Not really creepy but I noticed there must be something going on.

I was on holidays in a Turkish wakeboard park. They have some dogs there, which were strays but living there in the park now. Super friendly doggos.
One morning, we wanted to get up a hill for the sunrise. When we stepped out, two of the dogs slept in front of our house. They woke up and immediately understood what we were up to. They lead the way up the hill.

When we were up there, one of them was sitting down and staring into the sunrise with me. Nothing else. He just looked at the shiny orb in the skies. This dog was not lead by food, companionship or anything. He was just there. Probably admiring the sunrise, too. Nothing a dull animal would be able to.