http://www.youtube.com/watch?v=p9s9rjvyZVw
Buffalo Bill was a sitcom which aired on NBC for two seasons during the mid-1980s, starring Dabney Coleman as a sleazy talk show host at a small TV station. One particular episode was entitled “Jerry Lewis Week” and the storyline involved the studio being overrun with Jerry Lewis impersonators. One of the impersonators was played by an aspiring young comedian named Jim Carrey, who did not even receive an onscreen credit for this brief-but-convincing impression of Jerry Lewis.