10x143 - Late Show with David Letterman

In honor of a recent Team Rahal victory, Dave makes car noises; Steph/Monty discusses last weekend's Indianapolis 500 via telephone; ""What's on the Barbeque"" finds Biff trying to guess what type of meat is being cooked on the grill built last week on the show; Dave tries to persuade tonight's guests to also make engine noises.