I think Doom is one of scariest games out meaning there are plenty of parts that will make you jump when playing.
I didnt have money to buy F.E.A.R. yet!Everyone does know theres a F.E.A.R Directors Edition Out!
http://pc.gamespy.com/pc/fear-directors-edition/
I think all it adds is some extra footage and stuff so if you havent bought it yet might be worth buying it instead!