Have you ever seen The Exorcist or The Exorcism of Emily Rose, I'm sure you have, so why don't explore a little bit what an exorcism is.
I had made a research about exorcisms and all which is relacionated with them, for that I've needed the help of a priest. I've also search information about the two films I've mencionated before. I was helped by a real exorcist and I had an interview with him, which was so interesting. And finally I elaborated my own trailer for a film about an exorcism.
If you are interested in topics, like exorcisms, horror films, cinema, or catholicism you should see my research work.