19x37 - Late Show with David Letterman

Dave and Neil Patrick Harris have an awkward green room encounter. The Late Show cue card takes you into the weird world of candle-making. Top Ten Frequently Asked Questions About Leap Year. After years of speculation, Neil reveals the big "How I Met Your Mother" secret. The "John Carter" star runs into some trouble on his way to work in the Philippines. The Robert Glasper Experiment featuring Lupe Fiasco and Bilal perform "Always Shine" from the CD, "Black Radio."