Joke only comprehensible by south-midwest folks of a certain social class:

What's the difference between white trash, rednecks, and hillbillies?

Well, white trash folks get invited to a wedding and just throw on a stinky old Iron Maiden 1982 tour T-shirt, leave the trailer door open, and show up. Rednecks get invited to a wedding, take a shower, shave, get all fixed up, throw on a brand-new Dale Earnhart Jr. T-shirt, lock the trailer door, and show up. Hillbillies just ask, "What's a trailer? What's a door?"