Games dont generally scare me hehe. But on the other hand im really easily shocked/startled, resident evil 2 did that twice with the hands through the police station windows and the licker smashing through the interview room glass. Both times there was a complete silence and then a sudden loud noise, that always gets me.
Doom 3 scared me a bit, think it was when they introduced the pinky, i was in a room and i could see this fat ugly thing bending the catwalk bars outside the window, i didnt wanna go fight it heh, only took a few shotgun shells to kill though, it aint so tough!