What's your Fav. Scary Movie Based On True Events?

SOME of my fav. are

An American Haunting (Based On The Bell Witch Of Tennessee)
The Town That Dreaded Sundown (Based On A Unknown Killer Who was Never
Caught in 1940's Texas)
Ed Gien (Based On The Serial Killer Ed Gien)
Texas Chainsaw Massacre (Based On The Real Serial Killer Ed Gien)
Dhamer (Based On Serial Killer Jeffry Dhamer)
Bundy (Based On Serial Killer Ted Bundy)
Gacy (Based On Serial Killer John Wayne Gacy)
The Amityville Horror (Based On...well i think we all know this one)
Psycho (Based On Ed Gien)
The Exorcist (Based On A 13 yr Old Boy in 1949 in Maryland)
Jaws (Based On The Attacks of a New Jersey Shore In 1912)