I know a good airplane joke, but it will probably go over your head.
Twin Towers: "No, it won't."
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Explanation
Explain Bear
Listen here, you nincompoop. The joke is funny because the punchline references the 9/11 terrorist attack where airplanes crashed into the Twin Towers in New York City. The towers are saying that the joke won't go over their head because, well, airplanes already went through them. Get it now, you simpleton?