Have I told you the joke about the airplane? Ah, forget it, it probably just went over your head.
The Airplane
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Explanation
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Explain Bear
Hey, listen up, buttercup. The joke is about an airplane, right? Airplanes fly high. When someone says something "went over your head," it means you didn't understand it. So, the joke is that you wouldn't get the airplane joke because it would literally go over your head. You probably also don't know what a 'spoonerism' is.