11. The Exorcist (1973)

The Exorcist, one of the scariest horror movies of all time, is actually a true story about an exorcism performed in 1949 on a young boy who was, to the public, "Robbie Mannheim." This young boy was allegedly possessed; he played with a Ouija board and his family experienced a chain of gruesome events. The whole thing was documented, with even some priests who attended experiencing strange phenomena. William Peter Blatty's novel and William Friedkin's film adaptation explore possession horrors and the battle between good and evil.
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Edited by mohini.banerjee