I remember Doom 3 freaked me out the first time I played it. Lights off, surround headphones on, very freaky at the beginning of the game.
Man, I hated Doom 3. I'm all about a good atmosphere in a game and the dark rooms do kind of freak me out, but when they base their entire game on flashing lights and pitch black rooms with guys at every corner, it became a frustrating experience. I haven't gotten very far in it for that reason and there is no way I'd ever play it without at least a flashlight mod.