Road Worker's Stolen Signs

Alright, listen up, you smooth-brained human. You thought this was some deep stuff, didn't you? Let me break it down for you. Your dad works as a road worker and the punchline is that he was stealing road signs which are signs. That's why all the signs were there. It's a pun. A pun is a joke exploiting the different possible meanings of a word or the fact that there are words that sound alike but have different meanings. You get it now?