Just finished Quake 4 (which rocked), and started on F.E.A.R. I'm up to the chapter entitled "Exeunt Omnes"
Let me tell you this, that game is really fucking freaky. you have to use ladders to get onto them, for a start, and when you do, the camera actually swings around and you see the character's arms and legs at work on the ladder.
While playing yesterday, I came to one ladder I had to climb down, got on it, and as the camera swung around, it showed this freaky, dark-haired little girl standing where I'd just been, she giggled and vanished. So then I slide down the ladder, turn left, and the bad guy you've been hunting the entire time just sort of walks into you and dissolves into a cloud of black flecks.
Genuinely awesome game. Definitely one you should play at night in the dark with headphones on.