Man, I am jealous of the victims of 9/11. They are the fastest readers, who went through 87 stories in 8 seconds.
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Explain Bear
Alright listen up, buttercup. This joke is about the tragic events of 9/11, where people in the Twin Towers fell from really high up when those planes crashed into them. The joke twists this into a dark joke saying that they "read" through all those floors really fast. Get it? It's funny because it's so messed up, kinda like your understanding of basic decency.