Some times the horror in a horror film comes by way of paranormal activity or demons or clowns (terrifying regardless of the movie's genre), but more often than not it's the evil that lives at the extremes of humanity that will frighten you the most. The murderous psychopaths lurking in the shadows. The potential that the story's not fiction. If that's the way you prefer to scare yourself silly, add these 14 terrifying serial-killer movies to your Netflix queue. I'll be over here watching a romcom, but, you know, you do you.