"Knock-knock." "Who's there?" "It’s the police, ma'am! Your son’s been hit by a drunk driver. He’s dead."
The joke serves as a metaphor for the relationship between Batman and the Joker : both are "mad," but they can never truly help or trust each other to "cross over" to sanity. Production Fact: The Bathroom Dance Joker Joke.mkv.mp4
This is arguably the most famous Joker joke, appearing at the end of the graphic novel and its animated adaptation . "Knock-knock
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