In-N-Out Burgers is a West Coast institution. And one of the keys to their success has been keeping it simple. There are only four food items on the In-N-Out menu: Hamburger, Cheeseburger, Double-Double and French Fries.

In-N-Out compliments the food with the standard array of Coca-Cola beverages and three shakes: chocolate, vanilla and strawberry. And that's the menu in its entirety...

...or at least that's what they want you to think. The truth of the matter is that there is an extensive "secret menu" available for those in the know. In fact, the secret items actually outnumber the items legitimately on the menu.

This isn't just stuff made up by bored employees. If you order a Flying Dutchman, "Flying Dutchman" prints out on your receipt. It's in the computer.

There is lots of information out there on the Internet about the secret menu, but no one seems to have gotten it all, and a lot of what is out there is just plain wrong. Nothing is more embarrassing than ordering a secret item that doesn't exist.

So, through dilligent research, we have managed to produce what we believe is the definitive guide to the In-N-Out secret menu.

1. In-N-Out: the 20×20
2. Badmouth is in Maxim
3. In-N-Out’s Bible Passages