That’s what a hamburger’s all about. But did you know there’s the darker side to the California chain burger joint? Some say they have a cult-ish following, and “secret” menus just drive that idea forward. The hidden menu does exist, if you know where to look for. Go to your nearest establishment, and you won’t find it displayed on their walls; go online however, and you’ll find around 15 unaccounted entries in addition to your standard fare. John Marcotte has enlisted his minions of In N Out devotees to sample this secret menu.