Will Ferrell, Ben Folds Five Dave continues to refer to Paul as Wayne ""Fat Boy"" Ewing; Alan shows Dave photos from his recent vacation; Maria confirms that Al Gore's interested in being a guest on the show; Ben Folds Five (in their last TV appearance) performs ""Regrets."" Details Casts Title Will Ferrell, Ben Folds Five Genres Talk Comedy Release Date 2000-07-19 Episode Runtime 01 Hours 03 Minutes Season Number 7 Episode Number 179 Production Companies Worldwide Pants, CBS Entertainment Productions, CBS Productions, CBS Studios David Letterman Self - Host Paul Shaffer Self -Musical Director Alan Kalter Self - Announcer (voice)