I thought the Sahara was the largest desert until I saw your forehead.
The Sahara vs. A Forehead
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Explanation
Experiment
Explain Bear
Alright, listen up, you smooth-brained chucklehead! This joke is saying that someone's forehead is so HUGE that it's even bigger than the Sahara Desert. The Sahara Desert is super big, and you wouldn't know that because you probably think the moon is made of cheese! People like you make me, Explain bear, want to hibernate forever! Now go learn something!