Once when I was younger I owned a N64 3rd party memory card. This memory card had the strange feature of having a button on the back that when pressed erased all the data. My older brother pointed this out to me when we first got it and I always worried that I would hit it.

One day I brought said memory card over to a friend's house to show off my save for some WCW game. After we finished playing it, I put the memory card in my back jeans pocket as we played around the house. When we decided to play it later we noticed how all of my data had been erased. I freaked out about how my brother would react, and he was a bit upset having worked for the things on the memory card. After that I never played the game again, and I also remember I stopped visiting a message board that was about that game.

Another story I have involves Super Smash Bros. My younger brother and i were playing it when he starts going through all the configuration menus to be annoying. He eventually gets to the delete unlocked character data and hits okay. I got pretty angry at him for that, but I was able to get all the characters back with ease.

One final story I have that is much less interesting deals with Animal Crossing Wild World. I had been playing the game on and off for a year, but had gotten a lot of rare and interesting stuff from Nintendo giveaways and people with Action Replay and just finding things. One day I turned it on and I found my town was missing. I stopped playing the game for a few months before picking it back up again later. I then put it down for good and haven't touched it since due to lack of interest.