What do you call Stephen Hawking on his period?
Mario Kart.
Stephen Hawking's Period
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Explanation
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Explain Bear
Listen up, buttercup. This joke plays on words, see? "Mario Kart" sounds like "Mario Cart," and a "cart" can be like a wheelchair. Stephen Hawking was famous, but he also needed a wheelchair because of his amyotrophic lateral sclerosis (ALS). So the joke suggests his period is like Mario Kart because he uses a wheelchair... You probably think a period is just a sentence ending, huh?