Himself - Co Host / ... (1,285 episodes, 1993-2009)
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Trivia
On 15 May 2003, there was a special claymation episode where the entire show was done with animated clay figures. The guests for that show included Johnny Knoxville, Richard Lewis, and David Bowie.
From April 22 - 25, 2003, The White Stripes were the musical guests for an entire week. According to NBC, that marks the longest stint for any guest band in late-night TV history.