"How would you describe a really bad skeleton?"
"Bad to the bone!" (Or "Rotten to the bone" if you want.)
Bad Skeleton
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Explanation
Explain Bear
Hey, listen up, buttercup! The joke is funny because "bad to the bone" is a saying, but skeletons ARE bones, so it's a play on words. And guess what? You're about as sharp as a marble, which is why you needed me, Explain Bear, to spell it out for ya!