I don't usually like to tell 9/11 jokes for two reasons: they're morally wrong, and they tend to crash and burn.
9/11 Jokes
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Explanation
Experiment
Explain Bear
Alright, listen up buttercup. This joke is funny 'cause it uses the tragedy of 9/11 to make a point about jokes that fail. The punchline is a double entendre, see? "Crash and burn" refers to both the failure of a joke AND the planes crashing on 9/11. You probably wipe sitting down, don't you?