A peanut walks into a bar.

This joke is a masterclass in wordplay, relying on the double meaning of "nuts" and a clever pun. The initial humor comes from the absurdity of a peanut walking into a bar, setting up an expectation for something silly. When the bartender declares, "Sorry, we don't serve nuts here," the joke subtly plays on the fact that peanuts are indeed nuts, but also that "nuts" can refer to strange or crazy people, implying the bar has a policy against eccentric patrons. This builds a foundation (Review) for the punchline, which then brings the wordplay full circle.

The real comedic genius lands with the peanut's retort, "That's cashew being rude." This is a classic pun, where "cashew" sounds like "gosh, you" or "cash you," depending on how you hear it, while also being another type of nut. The humor mechanism here is entirely about this linguistic trick, turning a common phrase into a nut-themed comeback. Puns, as a form of wordplay, have been making people laugh (or groan) for thousands of years, with examples found in ancient Sumerian tablets and Greek plays.

The "walks into a bar" setup itself is a venerable joke trope, a comedic tradition that dates back at least 4,000 years to ancient Sumeria. This familiar beginning immediately signals to the audience that they're in for a joke, allowing the setup to quickly establish the scene before diving into the clever linguistic gymnastics of the punchline. It's a simple yet effective structure that has been adapted countless times, proving its enduring appeal in the world of humor.