Ghost Illusions in Clouds

Ghost Illusions In Clouds Screamer (Scary!) is a 30-second screamer video uploaded to YouTube by thescaryscreamers on January 22, 2011.

Video
The video that pretends to be an optical illusion video which shows a sad face hidden in a picture of clouds. It then shows a still picture of a cloud-filled sky. But at the end of the video, then a negative image of Regan MacNeil from The Exorcist pops up with the scream from What's Wrong? extremely loud and repeated four times. After some seconds the text "You just got pranked by a screamer..." is displayed.

Link
NOTE : The following video contains a screamer!
 * youtube.com/watch?v=P7hUcbkcJAY