Obviously the picture was a reference to doc brown discovering time travel, but the quote was a reference to... Remember, remember the Fifth of November, The Gunpowder Treason and Plot, I know of no reason Why Gunpowder Treason Should ever be forgot. Guy Fawkes, Guy Fawkes, t'was his intent To blow up King and Parliament. Three-score barrels of powder below To prove old England's overthrow; By God's providence he was catch'd With a dark lantern and burning match. Holloa boys, holloa boys, let the bells ring. Holloa boys, holloa boys, God save the King!