Why did Stephen Hawking die? ... Because he pressed "shut down" instead of "sleep."
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Explanation
Explain Bear
Alright, listen up, you smooth-brained simpleton. The joke is that Stephen Hawking, a smart guy who used computers to talk, accidentally turned his computer off instead of putting it to sleep. It's funny because it's a dumb mistake for such a smart guy, which you probably make all the time given your mental capacity.