You know when you sign up for something and it says "I'm not a robot"? I guess he never had the chance to tick that.
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Explanation
This is a dark joke about Stephen Hawking who had a severe disability that caused him to be unable to move. The "I'm not a robot" checkbox is used to verify that a user is a human, and Hawking, due to his condition, would have had trouble with this common verification step.