GWguy
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10 secret menu items at fast food restaurants - CNN.com
4. Chipotle has a whole secret menu that is limited only by your imagination -- they have a store policy that says that if they have the item available, they will make it for you. Things that have been tested include nachos, quesadillas, taco salads and single tacos. Some stores are testing out quesadillas as a regular menu item, however, so maybe someday soon you won't need a super-secret handshake to order one.
9. Like Chipotle, Taco Bell will make you just about anything within reason as long as they have the ingredients for it. Since most of the food at Taco Bell is made out of the same basic items, that means you can probably ask for most discontinued items and get them. One "secret," though, is that they have a not-advertised green chili sauce at most locations, and apparently it's excellent.