Bah. The Ring. First part almost put me to sleep. Middle part was okay, even if it didn't really make sense. But the last part was just plain insulting to the inteligent viewer. All I can say is that it was at least better than FearDotCom.
The only scene in a movie that ever truly made me jump was in The Devil's Advocate. Yeah, that one with Keanu Reeves and Al Pacino as the devil. The scene where the women are in the dressing room trying on clothes. That's the only time a movie has ever made me jump.
There are a few other movies that have disturbed me, but what disturbs me about them isn't always supernatural monsters. Gator Bait disgusted me with the continuous rape scenes, they seemed too realistic. The scene where the chick gets raped by the tree in Evil Dead bothered me too. But they didn't make me jump, they just made my stomach turn.