The look on a fat cashiers face when they have to figure out what a turnip is... priceless.  "Ma'am, ma'am! That's not a rutabega. That's a turnip. Ma'am! That's not baby spinich. It's turnip greens. No, ma'am. That ones not turnip greens. That's kale. facepalm mangos. Those are mangos."  Full disclosure: I'd never be short with a human cashier. I would just assume they were new or something.