What are some horror movies that are a true story or based on a true story?

I know the texas chainsaw massacre is one, and Jaws, and the amityville horror (or how ever you spell it) is one also. And the exorcist. ANY ELSE??What are some horror movies that are a true story or based on a true story?
Zodiac


BTK


Ils aka Them (french)


Audrey Rose


Psycho (Norman Bates based on Ed Gein)


The Hills Have Eyes


The Entity


Dead Ringers


Gothic


From Hell


Helter Skelter


Henry: Portrait Of A Serial Killer


The Serpent And The Rainbow


The Mothman Prophecies


Open Water


The Exorcism Of Emily Rose


Wolf Creek


An American Haunting


The Haunting In Connecticut





EDIT: RFC - The Texas Chainsaw Massacre is based on Ed Gein so yes it is based on a true story.What are some horror movies that are a true story or based on a true story?
The texas chainsaw massacre and Jaws are NOT based on true stories,





Amityville horror is loosely based on a 'true' story, but the said 'true' story was BS.





*edit- to the user below, i stand corrected, on the texas chainsaw movie.





*edit 2- Wolf Creek is not based on a true story, that never happened, it is loosely based on the back packer killer, Ivan Milat and the other killer who killed peter Falconio, a british backpacker, who was kidnapped, pressumed murdered by the outback killer, forget his name, Murdoch, that was it, But wolf creek is supposedly based on a character made up of these two blokes, both mad as cut snakes, but as far as what the user 2nd below says, that is just all made up, names, events etc for the movie, she is right about it being a good movie though, scares the crap out of ya, I'm an Aussie and it makes you think when going on long drives around the country.
Well, Wolf Creek is based on a true story...





In 1999, Ben Mitchell and his two British girlfriends Liz Hunter and Kristy Earl buy an old car to travel through the outback of Australia with little money. Their first stop is to visit a meteor crater in the isolated Wolf Creek National Park. When they go to their car, they find that it does not start and without option, they decide to spend the night in the car. Later, a local friendly man, the hillbilly Mick Taylor, stops his truck, offers to help the trio, finds that they need to replace the coil and proposes to tow them to his camp, where he could fix the car. When they accept the proposal, their dreamy vacation turns into a scary nightmare





I haven't seen it but a lot of people say it's really good


Hope I helped :)
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paranormal activity is not based on a true story - it's only being passed off as such to pull in some blair witch style hype. even the makers of the movie admit that.





amityville horror was based on a true story - although that true story was a hoax to sell a book. go watch that one - the original, not the remake.
A Paranormal Activity


The Strangers


Audrey Rose


The Entidy


The Serpant and the Rainbow


The Mothman Prophecies (This movie was scary in a weird way)


Open Water


An American Haunting


Them





I hope I helped
A haunting in Conneticut and Paranormal Activity. By the way Jaws is not one.
The Exorcism Of Emily Rose and An American Haunting.
An American Crime


The Girl Next Door


Wolf Creek


The Haunting in Connecticut


An American haunting