I'm sure we've all experienced the pain of loosing save files. Whether it's a cart battery die, memory card messing up or whatever.
Many years ago I let my Nephew play on Pilotwings 64. I'd unlocked everything and had mad scores, it was good. Next time I play the game (later that night) I discover he's decided to fiddle, and in the process deleted my file
My mate was slightly gutted when his Girlfriend's Sister's Husband borrowed his Playstation. And the FF9 (iirc) save that had something daft like 70hrs + was deleted. Never seen the chap so gutted before.
So what would you guys say were your biggest losses?