Many fast food chains have secret "not-on-the-menu" offerings. We all know about In-N-Out's Secret Menu, which is about as secret as William Shatner's hairpiece. But here are some others.
And you may be curious about McDonald's Land, Sea, and Air Burger which includes a beef patty, a chicken patty and a filet-o'-fish patty. Sounds like a joke but if it was, it isn't one any longer. People are going to go to their local Golden Arches and demand one of these.