Also, with the Mew and Suicune, I had gotten the hang of the cloning glitch on Silver. So I decided to try it with Mew and Suicune. Lost them both.
And both were from a trade.
I got scared of telling my friend about it... I don't think I ever told her.
Other than that... um... I suppose that's it. Unless Pokémon Mystery Dungeon counts where I stupidly turn the game off in a dungeon only to realize "Durr, this is a dungeon where it saves automatically, and if you turn it off, you lose everything on you".
Yeah... which is why I'm scared to go into dungeons that bump you down to level one. Seriously, Nintendo?