Scariest Video Game You Ever Watched Or Played

Two of them seemed to really pop out for me.

Outlast (Watch it late at night in the dark all by yourself and tell me you wouldn't be freaked out a little)

Same goes for this! Too bad the game got canceled but it's so freaky and disturbing

Silent Hill 2 terrified me the most when I was younger. Though Silent Hill 1 left a pretty deep psychological scar as one of my first horror games.
This part in Bioshock actually scared me so bad I had to pull my brother into the room with me and I didn't leave the bathosphere for like 5 min.
"Is it someone new?"