not a horror pic but 'jaws' scared me out of the ocean. after putting off seeing it for a couple years we broke down and went to see it at one of those dollar matinees and haven't scuba dived or snorkeled in the ocean since...

for true horror, i'd have to say the original george romero b/w version of 'night of the living dead'..."they're coming for you, margaret...they're coming to get ya!"