My son asked me what a 'dad joke' was.

This joke is a masterclass in meta-humor and self-reference. The humor doesn't just come from the words, but from the speaker's immediate action. The setup builds anticipation for a definition, and the punchline cleverly provides that definition by *becoming* the thing it describes. It's a comedic demonstration, where the explanation itself perfectly embodies the very concept of a "dad joke," eliciting the exact groan-worthy reaction it promises.

Ah, the dad joke! This beloved (and sometimes bemoaned) comedic art form has a rich, albeit informal, history rooted in family life. Dad jokes are typically characterized by their simple, often pun-based structure and their ability to generate a collective groan rather than a hearty laugh. They're a form of gentle, often wholesome, humor that fathers worldwide have perfected, designed less for cleverness and more for eliciting an endearing, eye-rolling response from their audience. They are a universal language of playful, low-stakes teasing, and this joke perfectly captures their essence.