Optical Illusion!

Optical Illusion!, known as Little noses illusion is a screamer video uploaded to YouTube made by VentMagic102 on February 21, 2012.

About this video
The video simply begins with the kid known a creator narrates himself to tell us the viewer, simply shows to explain the kid holding Little noses and stare at the viewer to getting more 10 seconds. but after at a 50 second mark, a picture of Regan MacNeil from The Exorcist pops up with the 2 high pitched screams, you can it hear a monster's roar sound effect.

Link
NOTE : The following video contains a screamer!
 * youtube.com/watch?v=jTM7CubBzoU