"Jaws" was actually scarier before we got to see the "shark". I've always thought that the shark, when it attacked Robert Shaw, looked a bit fake (of course it was fake
). "Jaws" was scarier when we could only imagine the dread unseen threat beneath the surface.
I find most of the "slasher" horror movies to be stupid. One recent movie that I did like that was scary was "What Lies Beneath" made by Michelle Pfeiffer and Harrison Ford a few years ago.