What was wrong with Stephen Hawking? His legs.
Hawking's Legs
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Explain Bear
Listen up, buttercup. The joke is that Stephen Hawking, a brilliant scientist, had a severe physical disability that affected his legs. So, the joke is a bit of a dark humor. It's funny because it points out something sad about his real life, ya know? You probably think the Big Bang is just when your momma stubbed her toe.