Knock knock.
Who's there?
Tank.
Tank who?
You're welcome.
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Explanation
Explain Bear
Listen up, buttercup! This joke is a classic "knock knock" play on words. "Tank" sounds like "thank," so when the person says "Tank who?" the response is "You're welcome." See, they're saying "thank you" without actually saying "thank you." You probably still don't get it, do you, genius?