I recently noticed that the Jamba Juice ingredient book doesn't say what's in the non-dairy goo they add to their smoothies, claiming that the specific composition is a trade secret. They say that if there's something you're allergic to, you can ask them and they'll tell you if it's in there, like a culinary game of Go Fish. I wasn't sure if this was legal, so I mentioned it to Ben Popken from Consumerist and he did an excellent job of running the story down. Turns out that Jamba's non-dairy blend contains...milk!
Via my brother, boing boing and ultimately, The Consumerist.