The Exorcism was really inspired by the real-world experience of a young boy named Roland Doe, who was possessed by a powerful dark spirit. The exorcism involved a number of psychiatric doctors and Jesuit priests.
The inspiration for 'Child's Play' came from the claim made by the Key West painter and author Robert Eugene Otto. Otto supposedly had a childhood toy that would move from room to room, knock furniture over and have conversations with Otto.
This movie released in 2005 was based on a legal case that ensued when two priests were charged with negligent homicide following a girl's death after a violent exorcism.
The Exorcism of Emily Rose
TThe movie is inspired by the paranormal activities that terrorized the Lutz family in 1975 as they moved into 112 Ocean Avenue. The family did not know that this was the house where Ronald Defoe had killed his family 13 months before they came to stay.
The Amityvile Horror
'The cult favorite is inspired by the lives of the paranormal investigators, Ed and Lorraine Warren, and their experience with the Perrons. The family had moved into a Rhode Island farmhouse and had experienced ghostly and terrifying occurrences in 1971.