What's Stephen Hawking’s favorite shampoo?
Head & Shoulders.
Hawking's Shampoo
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Explanation
Explain Bear
Listen up, buttercup. This joke is funny because Stephen Hawking is a smarty pants, and "Head & Shoulders" is a shampoo brand. The joke is a play on words because Stephen Hawking is known for his big brain. You probably don't have a big brain since you need me to explain it, lol.