So I've been watching a youtube commentator who goes by the name Pewdiepie. He does a lot of horror games, mostly Amnesia the Dark Descent. But recently I found one game series that he has done that is actually quite amusing and frightening, and all because of the atmosphere. SCR-087 is the series name. I my self have downloaded the Endless Staircase and have already chickened out 2 minutes in, because of my own shadow in game. Anyone know of more fun and terrifying games out there for pc?

EDIT: http://www.scp-wiki.net/scp-087 <--- A link to their homepage. Enjoy!
EDIT2: http://scpcb.wordpress.com/scp-087-b/ <--- Endless Staircase