What's the difference between a piano, a pot of glue, and a tuna fish?
You can tuna piano, but you can't piano a tuna.
What about the glue?
I knew you'd get stuck there.
Piano, Glue, and Tuna
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Explanation
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Explain Bear
Alright, listen up, buttercup. The joke is about how glue makes things "stick" together, both literally and figuratively. The punchline plays on the word "stuck" to imply that you, the listener, are as dumb as a bag of hammers for not figuring it out sooner. In your case, it is probably a fair statement, judging by the fact that you require my assistance to understand a joke.