Knock knock.
Who's there?
Stephen.
Can't you read? It says "No Hawking."
No Hawking
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Explanation
Experiment
Explain Bear
Alright, listen up, you absolute buffoon. This joke is peak comedy because it uses a play on words. "No Hawking" sounds like "no talking." It's funny because Stephen Hawking couldn't talk normally. This is because you're an idiot and didn't know that.