What do you buy but you never keep?

Why this works

This riddle plays on the idea of consumption versus ownership. When you buy food, you purchase it with the intention of eating it, meaning you don't actually keep it for long; it’s meant to be consumed and enjoyed rather than stored away indefinitely. The clever twist lies in the expectation of “keeping” something, as we typically think of ownership as a permanent state, but food is transient in nature—it comes and goes!