Why did the piano go to therapy?

This joke tickles our funny bone with a classic case of wordplay, specifically a pun. The humor hinges on the double meaning of "key issues." For a piano, "keys" are the physical levers you press to create music, and sometimes those can stick or malfunction, causing literal "key issues." However, when we talk about therapy, "key issues" refers to the fundamental problems or challenges a person might be dealing with in their life. The unexpected application of a human problem to an inanimate object is what makes us smile.

Pianos are fascinating instruments, first developed in the early 18th century, known for their wide range of notes produced by those very important keys. From grand concert pianos to upright home models, they all rely on their many keys working perfectly. The idea of such a sophisticated musical machine needing to lie on a therapist's couch for its troubles is wonderfully absurd and plays into our tendency to give human characteristics to objects, especially when they're giving us trouble.