9/11 Knock Knock

Knock knock. Who's there? 9/11. 9/11 who? You said you would never forget.

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    Explanation

    The joke plays on the common "knock-knock" format and the phrase "never forget" associated with the 9/11 attacks. The punchline twists the phrase to make it sound like a name when it's said after '9/11 who?'. It's dark humor because it uses a tragic event as a punchline.

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