Eyeless Clown Sonic is a Wierd,unusual version of Sonic from Sonic th Hedgehog CD. A number of it can be found in the sound test menu. Code being FM No. 46 PCM No. 12, and DA No.26.
Triggering this will yeild a message translating "Fun is infinite with Sega Enterprises. Mahjin." Mahjin is the Japanese word for "Devil" or Satan. This means Satan wrote it, but it was probably a joke.