You wanna know who didn't kick the bucket? Stephen Hawking didn't; nor did he bite the dust.
Stephen Hawking's Longevity
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Explanation
Explain Bear
Listen here, numbskull. You see, "kick the bucket" and "bite the dust" are euphemisms for dying. The joke here plays on the fact that Stephen Hawking, despite his medical condition, managed to live a long life, hence he did neither of those things.
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Original Joke