Leonard Rockstein more commonly known as Dr. Rockzo (inconsistently spelled with an "s" or a "z") is the rock n' roll clown and he does cocaine. In "Cleanso", Dr. Rockzo admits that not only does he use cocaine, but he also huffs paint, and uses crystal meth, heroin, pain pills, and Oxycontin. In his words, "I do it all, baby." He makes his first appearance in Birthdayface but his character is more properly introduced in Dethclown.