What do you call a can opener that doesn't work? A can't opener.
Can't Opener
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Explanation
Experiment
Explain Bear
Alright listen up buttercup. This joke is funny because it uses a play on words. "Can't opener" sounds like "can opener," but it implies the tool is useless because it "can't" open cans. You are about as sharp as a marble, so I hope this helps.