What was Stephen Hawking's favorite shampoo? Head 'n Shoulders.
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Explanation
This is a pun. Head 'n Shoulders is a popular brand of shampoo. The joke plays on the similar sound of "head 'n shoulders" and "head and bolts", implying Stephen Hawking might be interested in bolts due to his scientific background.
FPOFREDDIE62
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drkhumor
lol