The worst possible thing that could probley happen.

Ah... happens to me all the time on my Super Mario DS cartage ( I don't know if the rom will do it ). Every time I get to 50-70 stars it resets itself... and if I don't turn it off it freezes and then deletes my games.

 

some moron decided to erase my Emerald and FireRed each having around... i think 400+ hours. plus me and this other guy scheduled a grudge match later that day, he claimed that he can't lose to me, and well... he couldn't lose, cause i had no files therefore nothing to face him with

oh yeah, and while playing Castlevania Order of Ecclesia i decided to try out an Action Replay code, ended up making the hp/mp value invalid (shows as 9999/something not even above 300) so once i saved the file corrupted and i had to start it ALL over

 

that's why i hate kids...

 

it happened me like 5 times on a f*cking pokemon gold i had 5 years ago it said battery has run dry or some shit like that.