If Stephen Hawking was walking, they would have a hawk problem.
Stephen Hawking's Hawk Problem
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Explain Bear
Alright listen up, genius! This joke plays on the similar sound of "Hawking" and "hawk-ing." See, if Stephen Hawking, who couldn't walk, was walking everywhere, there'd be hawks following him all the time. So, you getting it now or do I need to draw you a diagram?