And from an old Straight Dope: “the most baffling corporate numbering scheme in American business today, namely Harold’s Chicken Shack… there are a half dozen unnumbered chicken shacks, all presumably vying for the honor of number 1, followed by numbers 2, 6, 7, 8, 9, 13, 14B, 15, 18, 19, 20, 24, 26, 27, 29, 35, 50, 51, 53, 55, 58, 65, and 71. Noting the numerous lacunae in this scheme, one wonders: Is there an unusually high attrition rate in the chicken shack business (the south side is, after all, the baddest part of town), or did Harold just lose track?” Apparently, the franchisees don’t have a very good success rate: one source says that there once were more Chicken Shacks, and that numbers seem to be retired with the Shack in question.