Hint: Fast food chain.
Answer: White Castle
White Castle is an American regional fast-food hamburger restaurant chain; the first of its kind in the United States. Known for its small, square hamburgers. Sometimes referred to, and today trademarked as "Slyders", its burgers were priced at five cents until the 1940s, and remained at ten cents for years thereafter while shrinking. For several years, when the original burgers sold for five cents, White Castle periodically ran promotional ads in local newspapers which contained coupons offering five burgers for ten cents, takeout only.
