I remember playing Silent Hill for the first time on the PlayStation and it reminded me of the Elementary School which is the earlier portion of the game. There so many small and creepy moments that ramps up the tension. It gets even scarier when the you enter the twisted version of the school.
I’m too much of a scaredy-cat to play straight-up horror games, so I’ll say:
Halo CE, first encounter with the flood
F.E.A.R, the level with the ladder and the vent.