Tom Waits performing Burma Shave on the Old Grey Whistle Test in 1979

From TED talks: "In a lively show, mathemagician Arthur Benjamin races a team of calculators to figure out 3-digit squares, solves another massive mental equation and guesses a few birthdays. How does he do it? He’ll tell you."

from the movie Crossroads. The end of the big guitar duel between Ralph Macchio and Steve Vai.