Punch line

A punch line (also punch-line or punchline) concludes a joke; it is intended to make people laugh. It is the third and final part of the typical joke structure. It follows the introductory framing of the joke and the narrative which sets up the punch line. For example, a certain bar joke has the framing of "A man walks into a bar...", the brief narrative of "he hurts his head", and the punch line of "It was an iron bar!"

In a broader sense, "punch line" can also refer to the unexpected and funny conclusion of any performance, situation or story.