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.
Not the creppiest, but The Sorrow’s section in Metal Gear Solid 3: Snake Eater totally caught me off guard. Still gives me shivers every time I replay that game.