Have you actually fallen for any of those 'unexpected' moments in a videogame?

I have. When I was 5 or so my dad and my brother were playing DOOM. I wanted to play it with them, then when they finally let me, they all left the room and I was alone in the dark playing it. I killed everything in the room, then didnt know where to go... Opened the door in the middle and several of those fireball-throwing demons were right in my face. Scared me senseless back then, I immediately shut the game down.

DOOM's a old game and it still creeps me out a bit. I tried the Doom 3 demo a year or two back, I don't think I even made it to the point where you kill anything; The characters themselves look creepy enough to get me to shut it down. :P
Most of them just make me laugh when they scare me. I was playing Counter Strike a few years back, there was one CT left (me) and one T... I was looking for the guy and he managed to sneak behind me and get me with a knife, made me jump lol.