These type of movies have never been my cup of tea. Frankly, they freak me out. They are however, the biggest money makers in Hollywood, netting significantly more cash than other genres. Think about it, you can use B or C actors(resses), special effects are really at a minimum and really, how much does fake blood and a chainsaw cost?
Speaking of freaking out, in my mind's eye I have several images of horror films etched in there. There is one in particular that is so ingrained in my pysche I think about it every week. I'm pretty sure it's from the original Friday the 13th where Jason Voorhees and the gang of soon to be murdered high schoolers are at some camp and he chases them around. The movie was released in 1980 and if I remember correctly, my cousin Robin and I snuck into the film, he convinced me to go, it was rated R of course, and we were both under 18, me just barely. I remember being scared out of my wits and scenes from that movie are with me today, 27 years later......ooooo I hated typing that number. Let me set up the scene for you......
The scene is the bathroom scene. So I walk into the bathroom at 10:00 at night at the UCLA campus after my class, and I walk into the stall and for some reason look up and around. There it is again, that feeling that someone is in the next stall, with a big ice pick and when I sit down to pee they are going to reach over the stall and stick that looped ice pick into my chin and drag me up to the top of the stall screaming, the blood catching in my throat, the breath leaving through the wrong hole........ah the horror of it all. How'd you like to have that scene play in your head everytime you went to a public bathroom at night?
Another scene from a movie that pops into my head at random moments is that scene from Aliens (I think it's the original Aliens wtih Sigourney Weaver) where the alien pops out of someones mouth or stomache. It's the alien baby from the momma's mouth. AAAARRRRGGGHHHHHHHHH!!! That movie freaks me out, too!