The best illusion ever

best illusion ever is a screamer video uploaded by YouTube user incenserd in June 16, 2007.

best illusion ever
The video starts off with 2 circles one big and small, the video asks you Which circle is bigger while luring the viewer to look closely into the picture. after about 20 seconds later, a zombie face with a purple background with a short scream screams at the viewer. The video is around 4,100,000 views as of 2017, and was viral in 2008

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