While yes, there are a ton of things you DO know about In-N-Out (like Animal Style, or how there are Bible passages at the bottom of your cup, or how it's way better than Five Guys or Shake Shack), there are even more you DON'T. As proof, here are 13 things you didn't know about Southern California's burger holy land (with some help from Stacy Perman, author of In-N-Out Burger: A Behind-the-Counter Look at the Fast-Food Chain That Breaks All the Rules).