In college I once ordered a black bean burger at a brew pub. I was massively disappointed when I discovered it was a patty made from black beans, not a burger with a bunch of black beans piled on top of the meat. It actually was pretty tasty, but the shock of realizing what I'd done took a bit of time to recover from. And no, I didn't send it back. I screwed up, knew it, and ate it like a man. I also gave a reasonable tip.