So, as a horror fan...and a writer and just horror knowitall in a lot of different aspects of the genre...I have never seen The Exorcist.
I have refused to see the film since ever. I used to be very religious and the idea that demonic possession can be out there has frightened me terribly for a long time. I'm not religious now, but I still believe in demonic possession.
I have seen The Exorcism of Emily Rose, REC, and other films that involve possession such as The Conjuring. But I have never seen The Exorcist. I recently bought a DVD of it which has led me to try and convice myself to watch it at some point during the month of October...but...who knows.