16x163 - Late Show with David Letterman

Dave welcomes the star of the FX network comedy, "It's Always Sunny in Philadelphia", Danny Devito. Topics include Danny's now infamous Youtube moment when it appeared he was drunk on the set. He claims he wasn't. Later, star of the Discovery Channel/Science Channel series, "Man vs. Wild", Bear Grylis stops by to discuss his series upcoming episode with superstar Will Farrell. Phoenix is the Musical Guest.