Late Show with David Letterman S14 E26 Robin Williams, J.P. Calderon, Sam Moore with Wynonna

Hartford-based meterologist Scot Haney interrupts Dave with a teaser for his five-day forecast; Tony crudely illustrates how North Korea's recent nuclear test will affect the US; Robin Williams discusses rehab and promotes "Man of the Year"; Sam Moore and Wynonna Judd perform "I Can't Stand the Rain."