5. They have one of the most extensive secret menus around
Nowadays, everyone has a secret menu. But while plenty of places just add an extra pepper and call it a day, Potbelly isn't messing around. Their menu has two shakes, a sundae, an ice cream sandwich, and 11 dreamy sandwiches. One of them is obviously the Elvis, but other picks include the Chicken Cordon Bleu, the Cheeseburger, and the Lucky 7 -- which is a Wreck and an Italian, united in holy, meaty matrimony.