Find the ghost

Find the ghost is a screamer video uploaded to YouTube by a user UserWasKilled on June 18, 2008.

The video gives a little bit of context on a picture of an abandoned house that is displayed on the background, it states that there is a ghost in the picture and prompts the viewer to find it, with a clue given that they must look behind the door besides the staircase, However, it's not there and after a while, a picture of Pazuzu as Regan MacNeil appears with a loud, female scream.

Link
NOTE : The following video contains a screamer!
 * youtube.com/watch?v=Lof0tcBq0C0