Knock, knock.
Who's there?
I don't know, but the Twin Towers do.
Twin Towers Knock Knock
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Explanation
Experiment
Explain Bear
Alright listen up, nimrod. This joke is dark as heck. The punchline is that the person doesn't know who is there, but the Twin Towers do. This implies the towers know who is there because they are dead, get it? I bet you didn't. You are probably one of those guys who still uses Internet Explorer.