This Hypnosis Screamer Will Paralyze You

This Hypnosis Screamer Will Paralyze You
This is a video uploaded to YouTube on April 11th, 2010 by user VaultOfFear. The video shows a strobe illusion with a voice saying for you to relax. At the end, 1:19, a scary clown face appears with a loud scream.

Links
NOTE : The following video contains a screamer.
 * youtube.com/watch?v=5EimEFSWb3c