Why are skeletons so calm?

The humor in this joke springs from a clever play on words, specifically a pun that twists a common English idiom. The phrase "to get under someone's skin" is widely understood to mean bothering, irritating, or annoying a person. It describes an emotional state of being bothered by something or someone.

However, the joke reinterprets this figurative expression in a literal, anatomical sense. Skeletons, by their very definition, are the bony frameworks of bodies, entirely devoid of skin. Therefore, it's physically impossible for anything to literally "get under their skin." This literal interpretation of the idiom creates a funny and absurd contrast (Review) with the emotional meaning we typically associate with the phrase.

It's a delightful example of how comedy can arise from taking an abstract concept and grounding it in a concrete, often impossible, reality. The joke relies on our shared understanding of both human anatomy and everyday language, making the punchline a satisfyingly obvious yet unexpected twist that tickles our funny bones.