What other scary games are there? (for PC)

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I can't believe nobody mentioned Vampire: The Masquerade - Bloodlines. That game has some incredibly disturbing moments and is one of the best RPGs in recent years (set in modern times too which is awesome). Too bad it has dicerolling like Morrowind, which means you can shoot someone in the face with a shotgun at point-blank range and get a critical miss. It is an outstanding game though and way underrated. Somebody mentioned Thief 3 and the Shalebridge Cradle which is a great and scary level but Thief: The Dark Project is very scary too and many of the horror levels are more memorable than the Cradle I find.