Assignment #186 in the 365 Things to Do in Memphis is to order a barbecue sandwich and put some slaw on it. Because to eat it any other way would be Un-American.
It would also be contrary to the way we're supposed to enjoy our barbecue sandwiches. Everyone knows that it's not a true Memphis sandwich if it doesn't have a mess of slow cooked, pulled pork topped with thick tangy, sweet sauce and a mountain of slaw.
(This example came from Central Barbecue, but you can get slaw on your sandwich at just about every barbecue joint in town.)