There is a hilarious way to use glitches to your advantage when it comes to Paper Mario on the Nintendo 64 for resale. YouTuber Stryder7x decided to set up the save slots on the game with an interestingly evil layout for the next purchaser of that copy to check out, as many do when they buy older games.
I would love to have purchased a game with a set of saves half as interesting as this guys. I always ended up with the half completed playthroughs or almost nothing actually completed on the game. Hope you enjoy this more creative way to put a game back on the market!