It seems appropriate that the possession movie just won't go away - perhaps the demons can't be exorcised? Since The Exorcist and The Omen breathed their terrifying brand of evil into the film world, we just can't get enough...
The Last Exorcism (2010)
Ashley Bell, who played possessed Nell in the movie, required no special effects for her demonic contortions - she has hypermobility and created the poses realistically herself.
The red Doc Martens she wears in the image above were necessary because the movie's insurance refused to cover her if she filmed them barefoot.
The Last Exorcism - which had its poster banned in the UK - was initially called Cotton after the Reverend Cotton Marcus in the film. However, it was delivered to cinemas under a code name: Scrutiny.
The Taking of Deborah Logan (2014)
Many people mistakenly believe that Anne Ramsay (who plays Sarah Logan) is older than her on-screen mom, Deborah (Jill Larson). This is totally not true; Jill Larson - famous for her role in All My Children - is 13 years older than Larson.
The Taking of Deborah Logan was unusual in that is never received a critical screening before release. However, it was popular with critics once in theaters; the realism and under-the-skin creepiness of the Alzheimer's premise created an incredibly effective movie.
The Haunting in Connecticut (2009)
The Haunting in Connecticut was actually filmed in Manitoba, Canada. It's supposedly based on a true story, featured in Ray Garton's book, In A Dark Place: The Story of a True Haunting. Ed and Lorraine Warren, the real life investigators who inspired The Amityville Horror and The Conjuring, were also involved in the case.
During the movie, we're told that the house was burned down and rebuilt. This is entirely untrue - the original house was never set on fire and still exists today.
The Devil Inside (2012)
Writers Matthew Peterman and Brent Bell created the movie after reading about a real life Vatican school for exorcism. The realism doesn't stop there: The Devil Inside features trial footage from serial killer Aileen Wuornos' court appearance.
Surprisingly enough, The Devil Inside is the most profitable movie of the last five years, using a tiny $1 million budget and making $101 million at the box office!
The Exorcism of Emily Rose (2005)
Amazingly, this movie is a PG-13. This is the case for several possession horrors, including The Haunting in Connecticut and The Last Exorcism.
Unlike The Last Exorcism's Ashley Bell, Jennifer Carpenter is not hyper-flexible and could not create the possessed contortions required. This was created using a doll and a harness for bending backwards. Carpenter does, however, have double joints, so she did contribute some natural effects of her own. The role almost went to Heroes and Californication's Madeline Zima.
The movie sparked an urban legend about a haunted dorm at the University of Minnesota - totally fictional, as this was merely where the movie was filmed - the real life story happened in Germany! Yes, The Exorcism of Emily Rose is based on a horrifying true life 'possession' - that of Annaliese Michel. Read more about the case here.
Of course, the grandaddy of all possession horrors, The Exorcist, deserves an entire article to itself - read it here.