Ben Folds Five makes a song up on the spot...using a shout from the crowd!

During a live concert in Berlin, someone from the crowd yells out something unintelligible, so the band makes up a song on the spot using that yell!

http://www.digg.com/videos/music/Ben_Folds_Five_makes_a_song_up_on_the_spot_using_a_shout_from_the_crowd