Late Show with David Letterman S12E141 Stupid Human Tricks, Christina Applegate, Brian Regan

Watch Late Show with David Letterman Season 12 Episode 141 Online – Like he does every Kentucky Derby weekend, Dave calls up Dave Johnson to hear him say ""...and down the stretch they come!""; Christina Applegate promotes the musical ""Sweet Charity"" and discusses a recent injury onstage; Brian Regan performs a stand-up routine about cholesterol and heartburn.