CHICAGO— Hypnotist Ed "Dr. Mysterioso" Allen is seeking a gimmick to set him apart from the hundreds of other hypnotists on the nightclub circuit. "I don't know, there's already a bunch of singing hypnotists and a ventriloquist hypnotist," said Allen, leafing through ads in the back pages of Getting Sleepy, a hypnotism trade magazine. "Maybe I could be the juggling hypnotist. Or wear some sort of funny hat. I just don't want to be lost in the crowd."