Don't worry: it's just a movie. It isn't real. Oh, except when it is. See, while many products of the silver screen are elaborate works of fiction, like Guardians of the Galaxy, Lord of the Rings, and One Direction: This Is Us, some are based on real things... things that actually happened. And some of them are utterly chilling.
What follows is a list of 50 movies that are based on real-life events. While some are likely apocryphal, most are all too genuine. So, read on and drink in the horror, safe in the knowledge that you'll never sleep quite as comfortably ever again.