1. Child's Play (1988)

Chucky is based on a real toy: Robert the Doll. In the early 1900s, a Florida kid received Robert as a gift and soon learned it was a life-size voodoo doll. But unlike Chucky, it isn't possessed by the spirit of a serial killer. Now Robert sits in a glass case, but if you bother him, prepare to feel his wrath.

2. The Silence of the Lambs (1991)

In 2013, it was revealed that cannibal Hannibal Lecter was based on Dr. Alfredo Ballí Treviño, a Mexican surgeon who killed and mutilated his friend, his lover, and quite possibly several hitchhikers.

3. The Town That Dreaded Sundown (1976)

This spooky ’70s movie is loosely based on the Texarkana Moonlight Murders, which plagued the small Texas town of Texarkana from Feb. 22 to May 3, 1946. The "Phantom Killer" preyed on young couples in parked cars. The murders remain unsolved.

4. Zodiac (2007)

In the ’60s and ’70s, the Zodiac Killer murdered seven people and then sent cryptic letters to authorities to taunt them about his identity. The case is still unsolved, and this movie is about a reporter trying to figure out who the dude was.

(source buzzfeed)

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