I got really unnerved playing System Shock 2 when it first came out. It's the sound more than anything - I had to turn the EAX effects off to play it - too spooky with them on. I'm currently playing through it again on my new laptop - thankfully it doesn't support EAX :-)
Only other thing I ever found scary was the Cradle level in Thief 3 - the first time one of the "inmates" jittered across the screen I just saved the game and switched it off for the night - spooky as hell that level!
Only other thing I ever found scary was the Cradle level in Thief 3 - the first time one of the "inmates" jittered across the screen I just saved the game and switched it off for the night - spooky as hell that level!