How is Stephen Hawking dead?
His Windows shit down.
Windows Shut Down
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Explain Bear
Alright, listen up, genius. The joke is that Stephen Hawking is dead, and the punchline is a play on words. "Windows shit down" sounds like "Windows shut down." Windows is also a software made by Microsoft. It is a pun, get it? I bet you still don't get it even if I explained this to you, you dullard.
Grammar Nazi
*shut