The "Knock, Knock" Joke
Featured in: Catch Me if You Can (2002)
In Catch Me if You Can, Tom Hanks trades in his harmless suburban charm for the stern, square role of FBI agent Carl Hanratty. During a scene when his fellow agents are hassling him for being so dull, Hanratty asks them if they would like to hear a knock-knock joke. They agree, and when the agents ask who is there, Hanratty dryly says, “Go fuck yourselves.”
Any time Hanks curses, it’s startling. He’s like the Danny Tanner of the film world. Even though this knock-knock joke is tame, even by the standards of elementary school vulgarity, it’s still a shock coming out of Hanks’ pristine lips.