An Optical Illusion (Not from Stareclips.com)

An optical illusion (not from stareclips.com) is a screamer video uploaded by YouTube user hotogainc in April 21, 2006.

Video
The video tells the player to look at a black dot in a negative image of a landscape. The landscape then turns black and white. after about 32 seconds, a continuously looped bad contrast video of a boy yelling at the camera is shown along with the creator's scream.

Link
NOTE : The following video contains a screamer!
 * youtube.com/watch?v=IiGda5Q9eGQ