Thief 1, 2, 3
I don't believe I've shit my pants worse than any mission involving the undead within these games. I'll have to upload some of the sounds they use, cause goddamn, I was playing around midnight last night and it made me really want to just shut my computer off. This isn't even a horror game.

I just beat Thief 2 about an hour ago, and I was a little disappointed that there weren't as many missions involving the undead (although compared to the first one, I should say this is a good thing). The in game graphics are seriously horrendous and aren't improved (over the first), however I'm really impressed with the lighting and AI in these games. How many games (especially when this Thief 1 came out) involved AI being able to hear your footsteps depending upon surface type/speed/distance, or see you depending upon how much light was hitting your person?

On to Thief 3.