WalMart in Germany.

Went there in the late 90s. Didn't do any market research and just thought "What we sell in the US will be a success here too", which not just lead to them selling products that Germans weren't familiar with, in capacities that no German would ever buy, but also stuff like bedsheets that didn't fit on German beds.

Even worse: They apparently didn't know how well regulated workers rights are in Germany compared to the US, so when they did things like forcing the employees to start the workdays with cult like chants, forbid co-workers to have any kind of romantic relationship AND encouraged the staff to snitch on them if they would see someone hold hands or kissing, they got sued and after a few years just though it's easier and cheaper to get the [hell] out of Germany, instead of adjusting to the culture.