Dave Letterman is hanging up the mic and leaving the late night TV game after what seems like a billion years. So he's having a ton of people come on his show to say their goodbyes and maybe have a laugh or two. One of my favorite comedians, Tina Fey, stopped by the show to pay homage to the wardrobe choices she made while coming on the show. She decided this was going to be the last nice dress she ever wore, so she gave it to Letterman. Check out the video!