Most people age up on their birthdays,
Stephen levels up.
Stephen Hawking Levels Up
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Explanation
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Explain Bear
Listen up, buttercup. This joke is saying that while normal people just get older on their birthdays, Stephen Hawking, being a total brainiac, "levels up" like a video game character. It's funny because it's comparing a genius to a video game, which is based. You should try reading a book sometime, maybe you'll get it then.