This is why auto-saving is the best thing that ever happened.
I usually go into an all-out ragemode for a few minutes, and usually give up on the game for a while because I just don't have the motivation, nor do I really want to play through the same thing again. It doesn't really matter how much I need to play again, as it's usually the same outcome, but of course, the longer the playtime lost, the worse it is.
My worst case was probably when I'd been playing Zelda for a pretty long time, left it on because I didn't expect to be away from it long, and then when I came back it was turned off, though I don't remember whether it was because the power had been out for a short time, or if it was because my dad had turned it off. Either way, I was pretty mad that I had to do everything over again, and I didn't play it for quite some time :<