Knock knock. Who's there? It's the police... Who? It's the police, let me in so I can get some donuts!
Police Want Donuts
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Explanation
Experiment
Explain Bear
Hey, listen up, buttercup. The joke is that the police want to get in to get some donuts. It plays on the stereotype that cops love donuts, which is why it's funny. You probably think cops are really strong, but they just like sugar and sitting on their butts.