For nearly 40 years, Hollywood has been obsessed with the possessed.
Since the 1973 blockbuster "The Exorcist" unleashed a head-spinning, pea-soup spewing, foul-mouthed and demon-possessed girl on the American imagination, a host of films featuring exorcisms have hit the silver screen.
And why not? To date, "The Exorcist" franchise -- two sequels and two prequels -- has grossed nearly $500 million worldwide.
"Exorcism is Hollywood's wet dream," said Diane Winston, an expert on religion and the media at the University of Southern California. "It's taking on the most fundamental questions of good vs. evil and doing it in a way that's titillating and vaguely scandalous. How could that go wrong at the box office?"
The latest film to test that premise is "The Rite," which opens in theaters Friday. The film is loosely based on a nonfiction book by American journalist Matthew Baglio and stars Anthony Hopkins as an aging exorcist who might be possessed by demons himself.
Baglio's book follows the Rev. Gary Thomas, a Silicon Valley priest who was sent to Rome in 2005 by his bishop to train as an exorcist. Thomas and Baglio consulted on the film, visiting the set in Budapest to ensure accuracy.
"They were really anal about wanting the exorcisms to appear accurate," Thomas said. "And it is. Nothing in the movie is far-fetched, impossible or something that hasn't already happened."
Exorcist movies have become a mini-genre in Hollywood, said Robert Thompson, an expert on pop culture at Syracuse University. But unlike most horror movies, exorcist films possess a hair-raising dose of realism -- after all, the Roman Catholic Church still performs exorcisms.