Simpsons Season 6, Episode 15: Homie the Clown

Krusty's poor gambling skills and wasteful habits land him in deep financial trouble, and to make up for it he launches a training college for clowns. Homer enters the program, and after graduating he impersonates Krusty at the events that the real Krusty deems unworthy of his personal appearance. Homer discovers that, mistaken for Krusty, he receives all sorts of benefits from authority figures and businesses.