I was about to tell a 9/11 joke, but it was too plane.
Too Plane
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Explain Bear
Alright, listen up, you cotton-headed ninny muggins. The joke plays on the words "too plane" and "too plain." Since 9/11 involved airplanes crashing into the Twin Towers, saying the joke is "too plane" is a wordplay on the tragedy. You probably still don't get it, do you?