Some of the best horror movies are actually based on true stories, and that makes them all the more frightening. Horror and cinema go together perfectly, and some of the most memorable films from each era have come from the horror genre. From creepy monsters to deadly killers, horror movies are always dreaming up new ways to mortify viewers.

One of the easiest ways to add some extra chills is to slap on the tagline "Based on a True Story" . While the veracity of that claim has been stretched to its absolute limit over the past half-century, even a kernel of truth can have audiences flocking to the theater in droves.

It's no secret that horror filmmakers draw inspiration from real life, and those stories inevitably find their way onto the big screen. Gruesome true crime cases, suppo

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