F.E.A.R. 2 had the scariest sounds in recent memory. Sounds related to ghosts really creep me out and give me chills and make my hair stand on end. F.E.A.R. 2 did that a lot to me when Alma was around and the visuals timed with the sound also greatly added to the effect.
I agree the chainsaw guys in RE4 were scary and so were the robed granados at the castle when they snuck up chanting behind you. The growling of dogs in the hedge maze was freaking scary too. Nothing in RE4 that made my hair stand on end though!
Got one more. In System Shock 2 i became scared of being tricked. For example the first robot I encountered was coming up to me saying he "needed my help, needed my assistance" and then suddenly he started attacking me. I was totally caught of guard and he scared the daylights out of me. All those robots throughout the game calling for you, trying to trick you to show yourself in the hallways always sounded so scary. "Wheeeeere arrrrre youuuuu..." "We don't want to hurt you, we want to be your friend" haha or something like that. Plus the Shodan was really scary in that game too.
What's the scariest game you guys have played, one that you couldn't bring yourself to play in the dark at night?
