This one time I was playing Pokémon Gold with a friend, and he wanted a Totodile so I trhought "okay, I'll make a new game, give him the totodile, then power-off after the trade, I won't save, so I won't lose my sweet save file!"
Well, the game saves right before you trade. Spamming "A" through this was natural to me seeing as how they say "OMG SAVE GAME OVERWRITE ARE YOU SHUR" all the goddamn time I just kind of filter it out.
Then I turn off the game, turn it back on, and notice my name is now "AAAAAAA."