My boss told me I was late for work again.

This joke gets its chuckle from a clever twist on a familiar saying. The humor mechanism here is primarily wordplay, taking the well-known idiom "better late than never" and applying it in a literal, defiant, and slightly absurd way to a situation where it clearly doesn't fit. The boss expects an apology or an explanation for tardiness, but instead, the employee delivers a sarcastic retort that reinterprets a proverb about perseverance into an excuse for poor punctuality. It’s a classic example of using wit to playfully challenge authority, even if it might land you in more trouble.

The real-world context for this joke is highly relatable: the universal experience of being late for work and the awkward conversation that often follows with a supervisor. The idiom "better late than never" itself has roots that stretch back through history, appearing in various forms in ancient Greek and Latin, and becoming popular in English through writers like Chaucer. Its widespread recognition makes the joke's subversion even funnier, as we all instantly grasp the intended, more positive meaning of the phrase before it's comically repurposed as a defense for chronic lateness.