With a budget of $1m the movie made $101m at the Box Office making this the most profitable movie of 2012.
Initially written as a conventional thriller until lack of interest from various studios prompted William Brent Bell and Matthew Peterman to retool it as a found-footage/ documentary feature.
Paramount picked up the film, hoping for a similar level of success to the "Paranormal Activity" films.
A sequel was mooted until director William Brent Bell started receiving hate email over the ending of the film.
Matthew Peterman and Brent Bell first came up with the idea for the movie when they read an article about the Vatican starting a school for exorcism.