Since the first time I heard "Piano Man", as a kid, I've loved Billy Joel.  Then he married Super Model Christie Brinkley and he gained my respect.  And now after I watched this video my admiration is reconciled.

Billy Joel was doing a Q&A at Vanderbilt University and a big fan of his, Michael Pollack, jumped up and ask the Piano Man if he could accompany him on the piano as Mr. Joel sang his hit song "New York State of Mind"

Billy Joel thought for a second and then he just said 'Okay'.  And as you can see in the video, this kid can play.  Bravo Billy!