I don't get too scared of slasher stories, myself; I usually have something heavy or sharpish around the house that I could use to hold off a slasher if the story somehow Came True. Some of the supernatural ones get under my skin, though. I mean, Friday the Thirteenth movies? Not scary. Poltergeist? SCARY AS HELL.

On a more mundane note, The Andromeda Strain was one of the scariest books I ever read, and the glowing green bugs episode of X-Files was possibly the freakiest one I can think of, so there's the 'little tiny things that can KEEL YOU DEAD' factor too.