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What's The Scariest Horror Film That Most People Don't Realize Is Based On True Events?

"Based on a...wait, what?! Turn it off!" —Me, watching these movies.

Horror movies are freaky enough on their own without having to be anchored in reality...but is there anything more terrifying than finding out that an already terrifying horror movie is actually inspired by something that really happened?!

Warner Bros.

So — with that in mind — what's a horror film that a lot of people don't realize is actually based on a true story/inspired by true events?

Rogue Pictures

Maybe you're often shocked when you realize a lot of people don't know that The Texas Chainsaw Massacre (1974) is based on IRL serial killer Ed Gein's crimes.

Bryanston Distributing Company

Or perhaps it's a deeper cut, like Wolf Creek (2005), that you couldn't believe was actually inspired by real-life events.

Roadshow Entertainment

Heck, maybe it was YOU who didn't realize that A Nightmare on Elm Street (1984) was actually inspired by police reports of teenagers dying mysteriously in their sleep.

Warner Bros.

Share the horror movie that you feel like most people don't realize is actually "based on" and/or "inspired by" true events, and WHY it's so freaky, in the comments below for a chance to be featured in an upcoming BuzzFeed Community post and/or video!

American International Pictures