This was 2007 or so. Gamestop had a used game return policy, 7 days no questions asked, full refund. People would abuse this CONSTANTLY, like a rental service. We knew it, and we were able to flag people who did it too often and decline them the returns (manager policy, not company policy).
Then there was this one bitch. Old lady, gaggle of grandkids. Seemed so sweet, was very nice to us while in the store, asking for help, recommendations, etc. Bought them a PS2 and a freaking GIGANTIC stack of games, like had to be 20-25 at least. Her total came out over $400. I rang her out, handed her the multiple bags of stuff, and said to the kids something along the lines of "Wow, you guys are lucky to have such a great grandma! This many games will last you months!"
The grandma chuckled and said "Oh they're only in town for the week. You guys have that 7 day return policy, I'll see you in 6 days!"
Source: https://www.reddit.com/r/AskReddit/comments/bicr5z/gamestop_employees_of_reddit_what_are_some_of/em00vbp/