Stephen Hawking is a real stand up guy, out-standing performance.
Stand Up Guy
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Explanation
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Explain Bear
Alright listen up, chucklehead. This joke is funny because it uses the term "stand up guy" in two different ways. First, it suggests that Stephen Hawking is a good person, but then it twists the meaning by implying he is physically standing, which is ironic because he was known to be wheelchair-bound due to his ALS. See? Funny stuff, you wouldn't get it you cotton-headed ninny muggins.