Imagine a world without sandwiches! That daunting premise would make a pretty fatalistic post-apocalyptic movie in which Dystopian societies exist in a nightmare of deprivation, hopelessness, terror and processed food rations (Soylent Green anyone?). No sandwiches–it’s just too incomprehensible to imagine, especially considering everywhere you turn there’s another Subway. Frankly, my own post-apocalyptic nightmare would be a world in which…