"9/11 people" say that jet fuel cannot melt steel beams.
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Explanation
Explain Bear
Listen up, buttercup. The joke plays on the conspiracy theory that jet fuel couldn't have melted the steel beams in the World Trade Center during the 9/11 attacks. People who bring up 9/11 are called "9/11 people," and they say this. It is funny because it is a dark joke.