The scariness comes from the shit that could happen in real life.

An old boyfriend and I used to couple up and go to the drive in quite a bit, usually to watch a gory movie. Fast forward a few years and those movies became a reality when my sister was murdered and chopped into pieces in California's worst mass murder. Two guys living in the remote Sierra Nevada mountains lured people up there, tortured and killed them in a 8x10 concrete torture chamber on the property. I can watch scary monster stuff but I can't watch movies where humans get hacked up anymore.