Bury the Evidence
People are animals, at least according to the OP. They worked at an all-you-can-eat catfish buffet and saw all kinds of breeds of people, so we assume they’re speaking from experience. Obviously, not all patrons are disgusting creatures, but the people in this story are, without a doubt, wild beasts.
It was bad enough that they didn’t finish their extra serving of catfish, but to make matters worse for no reason at all, they stuffed their leftovers on a plate, drowned it in condiments, then poured iced tea all over their hellish concoction of catfish and ketchup. Why would you do that?