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In page Cheers:

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The eighth-anniversary special of Late Night with David Letterman, airing in 1990, begins with a scene at Cheers in which the bar's TV gets stuck on NBC and all the bar patrons decide to go home instead of staying to watch David Letterman. The scene was re-used to open Letterman's final episode in 1993.[1] A similar scene aired in the Super Bowl XVII Pregame Show on NBC, in which the characters briefly discuss the upcoming game.[citation needed]