I remember the singer/guitarist at a local pub who sang a wide range of stuff (it was a pub gig, after all). One night he started reciting "The Shooting of Dan McGrew." He went on, with very few people paying any attention, until he got to the bit about the derro coming in out of the night and sitting down at the piano ".. my God! how that man could play."

The he went straight into "The Piano Man" - and guess how many people noticed?