There was nothing particularly different about the December 19, 1985 episode of The Tonight Show with Johnny Carson, that is, until David Tolley raised his hand.
When it was time for the next act, Johnny explained to the audience that classical pianist, Horatio Gutierrez wouldn't be playing for them that night. He had closed a car door on his hand by accident, and he didn't want to risk more injury by playing the piano. Since they were in a tight spot, Johnny thought he'd try something different.
He asked the audience if there was anyone who could play the piano, a few people cheered. Then he asked if there was anyone who had trained for over five years. That's when David raised his hand. He climbed the stage and bowed, then took a seat at the piano.