Optical illusion (darknaruto22)

For other screamers named "Optical Illusion", see the Disambiguation Page.

Optical illusion is a screamer video uploaded to YouTube by darknaruto22 on September 3, 2010.

The video starts with an image of the 7 in the Müller-Lyer illusion. However, after 8 seconds, a picture of Bitter (a clown mask created by the late Don Post) pops up, accompanied by the same scream from the 1988 film Slugs. The scream in this video would later be used in Sonic.exe.