 Carson hinted in his 1993 interview that he did not think he could top what he had already accomplished.He rarely appeared elsewhere after retiring, providing only a guest voice on an episode of "The Simpsons," which included him performing feats of strength and featured Bette Midler as well, and a cameo on the May 13, 1994, "Late Show with David Letterman" where he delivered a Top 10 List and sat in Dave's chair for a minute.In 2005, after Carson's death, it was revealed that he had made a habit of sending jokes to Dave Letterman via fax machine which Letterman would then sometimes incorporate into his monologues.