Ghost Clown: (to Scooby) Watch the pretty coin of gold, and you will do as you are told. You are brave, and that's a fact. You will do the high wire act.
This is the first time shaggy gets hypnotized.
Villian: Harry the Hypnotist
Reason: He was revenging himself on the circus that had sent him to jail for theft.
The fast-paced exciting circus music heard during Scooby's crazy circus stunt is taken from Wacky Races.
Adapted loosely into the comic book story "The Phantom Clown" (Gold Key issue #9, December 1971).