The quoted joke illustrates a humorous misunderstanding between a construction worker and a diligent security guard. The guard suspects the worker is stealing valuable items hidden in a wheelbarrow full of sawdust, but throughout the ordeal, he finds nothing of interest, as no one pays attention to the sawdust itself. This situation reflects the paranoia and fixation on minor details often seen in security roles.

Years later, when the two meet again, the security guard finally gives in to his curiosity, believing the worker must have been hiding something significant. The punchline reveals the truth: the worker was simply taking the wheelbarrows, not any valuable goods. This twist emphasizes how sometimes what appears suspicious may have a simple explanation, and it showcases the humor in the security guard's endless scrutiny.