"How would you describe a really bad skeleton?"
"Bad to the bone!" (Or "Rotten to the bone" if you want.)
Bad Skeleton
Categories
Explanation
Experiment
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!