The always charming First Lady went on David Letterman's show last night, and they had quite the conversation. Dave started out by pressing her on whether the President comes home and says "Oh, that John Boehner, what an idiot." She deftly managed to reply with, "It has never happened. Never, never. He is always upbeat, particularly about Congress." Her almost-straight face is a sight to behold. They then moved on to talking about her father, who had MS, and the parenting lessons she learned from him. At one point, she almost chokes up before saying to Dave, "Don't make me cry. This isn't Oprah." Zing!