What does a tuna, piano, and a tub of glue have in common?
You can tune a piano, but you can't piano a tuna.
But what about the glue? said Bob I. I knew you would get stuck on that!
Tuna, Piano, and Glue
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Explanation
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Explain Bear
Okay, so basically, you're so dense that light bends around you. The joke is a pun. You can "tune" a piano, and the punchline plays on the phrase "get stuck" because of the glue. Get it? I doubt it.