Grave Encounters is a 2011 Canadian horror film that follows the crew of a paranormal reality television program who lock themselves in a haunted psychiatric hospital in search of evidence of paranormal activity as they shoot what ends up becoming their final episode.

Now, I have not seen these movie myself (it has a cult following) but the premise certainly sounds like it could be a screaming success. This image from the movie certainly freaked me out and would make a great Halloween mask.