Late Show with David Letterman: Mary Tyler Moore treats Late Show viewers to a video clip of Dave from her 1978 variety show, "Mary," in which she smashes a grapefruit in Dave's face. Also, Dave, Biff, Gaines, Anton and Laurie Diamond get their teeth cleaned.

Starring:

Alan Kalter, David Letterman, Paul Shaffer

Genre:

Comedy, Music, Talk-Show