I once had a lady and her teenage son come in to trade in several dvds and games they had just stolen from the Walmart behind the strip mall where our store was. Walmart employee calls me to ask if they are in my store and says the cops are on the way, so stall or do what you can to keep them there. I said sure! I told them the cash vs. store credit value of their items without mentioning that I can't even take them because they are still wrapped in the cellophane. I walk them around the store and talk about which games are the best value for the money, etc. The cops show up and ask them to step outside and I just smile and go back behind the counter. They followed the police out and one officer comes back a minute later to get the merchandise. Last I heard about it. Not a horror story but definitely weird.
Then there was this wealthy couple who had three kids and each kid had a wii, a PS3, and an Xbox 360. They would preorder every major game that came out for each system, always the deluxe edition. They spent a ton of money in our store. And they were CRAZY. So abusive to every employee, they cussed at us and called us stupid, they would ask for things they knew they couldn't have and then throw a fit, they would scour their receipts for anything that could be a mistake and make you explain it to them over and over. I went to work at a different company and they came into my store there, and got in line for my favorite cashier. I immediately called a manager over when it was their turn to check out, explained how I knew then and that there was a 99% chance they would make the cashier cry. He went over and just as he got there they were beginning to raise their voices about some supposed mistake. Luckily that manager is super good at "handling" people and got them out without letting them get a word in edgewise. I practically had ptsd from dealing with them. I think they got off on abusing people together. They would sometimes be laughing as they did it. If they found a legitimate mistake in anything, their faces would just light up. Truly evil people.
Source: https://www.reddit.com/r/AskReddit/comments/bicr5z/gamestop_employees_of_reddit_what_are_some_of/em024lb/