Guys, we should not make fun of 9/11. Like, that stuff is just plain out crazy. Like, you all should not let that fly.
Don't Let It Fly
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The user is making a pun using the phrase "let that fly", which is a play on words with "plane", referencing the airplanes that were crashed into the Twin Towers on 9/11. The user also says that people shouldn't joke about 9/11, but then proceeds to make a pun about it.