The YouTube description by CBS of Tommy Johnagin's performance on Friday's Late Show with David Letterman reads, "Watch the comedian's entire stand-up act from Friday, April 15, 2011." Well, that's not entirely true. The clip cuts off Johnagin's opening remarks of self-deprecation, in which he points out that he was the third part of your dream comedy night that included Letterman and first guest Tina Fey.
Still, solid stuff. And you'll learn something about kissing, too.