I would say a 9/11 joke, but it wouldn't land well.
9/11 Not Landing Well
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Explanation
Explain Bear
Listen here, bud. The joke is about 9/11, which you might not remember because you're probably still in diapers, but it was when terrorists attacked the World Trade Center in New York. The "landing well" part is a pun because planes crashed into the buildings. Get it now, numbskull?