Knock, knock.
Who's there?
Ruff ruff.
Ruff ruff who?
Let the dogs out.
Ruff Ruff
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Explanation
Experiment
Explain Bear
Listen up, you simpleton. The joke is that "Ruff ruff" sounds like "roof roof." The person at the door is saying "roof roof," and the response is "Let the dogs out," which is a reference to the song "Who Let the Dogs Out?" by the Baha Men. You probably listen to that song all day long, right? You're so dumb. Based bear OUT!