Stuart Frankel is credited as the person who inadvertently created the $5 footlong craze at Subway. Five years ago Frankel owned two small Subway sandwich shops at either end of Miami's Jackson Memorial Hospital. After noticing that sales sagged on weekends, he came up with an idea: He would offer every footlong sandwich (the chain also sells 6-inch versions) on Saturday and Sunday for $5, about a buck less than the usual price. "I like round numbers," says Frankel.