This couch gag appeared twice in the Simpsons and was updated the second time to show the family racing through New York to appear on the show, with a slightly greyer, bespectacled Letterman in the chair. The two episodes are 12 years apart, which says something for Letterman's longevity too. First aired: December 9 1993 / January 15 2012 Episode: The Last Temptation of Homer / The D'oh-cial Network