19x111 - Late Show with David Letterman

Dave welcomes actor Tracy Morgan, U.S. Men's Olympic High Jump silver medalist Erik Kynard, and musical guest Ben Howard. Top Ten Things We've Learned About Mars. Tracy Morgan tells Dave about his new "Jaws"-themed shark tank. Did Tracy Morgan go to high school with Mitt Romney? The "30 Rock" star tells all. Olympic silver medal champion Erik Kynard, Jr. tells Dave how he got involved in the high jump.