Dave shows the woman/duck and ""rabid dingo"" clips yet again; Dave discusses the new theory that a meteorite may prove life on Mars, prompting Alan Kalter to go berserk with conspiracy theories; Emmylou Harris, Gillian Welch, Alison Krauss and Dan Timinski and the Soggy Bottom Boys perform a medley of songs from the film O Brother, Where Art Thou?
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Ready to Watch Late Show with David Letterman, Season 8, Episode 108?