Hawking's Shampoo

What's Stephen Hawking’s favorite shampoo?

Head & Shoulders.

Shampoo
Head
Stephen Hawking
Hair
Body
Shoulder

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.