Why don't skeletons fight each other?

This classic one-liner is a masterclass in wordplay, hinging on the double meaning of a single word. The humor comes directly from the pun on "guts." In one sense, having "guts" means being brave or courageous, the kind of nerve you'd need for a fight. In the other, more literal sense, guts are the internal organs that, well, skeletons are famously lacking. The punchline works by applying the literal, anatomical meaning to a situation that calls for the figurative one, creating a perfectly logical and absurd reason for their pacifism.

Skeletons have a long history of being depicted as spooky, fearsome figures. From the reanimated warriors in myths and fantasy films to the universal symbol for poison and death, we're used to seeing them as menacing. This joke brilliantly subverts that expectation. Instead of a terrifying, clattering brawler, we get the image of a cowardly pile of bones too scared to throw a punch. By giving this spooky icon a very human and slightly pathetic weakness, the joke deflates the scariness and turns it into pure silliness.