The countdown to David Letterman's final show has officially begun. The heavy-hitters are starting to swing through, and last night it was Billy Crystal who made his final appearance by the king of late night's side.

There are few in show business who have been coming on Letterman's shows since the very beginning, but Crystal is one of them. Last night to say farewell he paid tribute to the legendary host with a musical number that touched on some of the most memorable moments of Letterman's career, like the time Cher called him an asshole or the time Drew Barrymore showed him her tits, which apparently is a word you can't say on network television.

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