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Which restaurant that serves square burgers is recognized as the first fast food chain, and was featured in the title of a 2004 stoner comedy movie?
White Castle. Harold and Kumar Go to White Castle" brought national attention to the chain which is based in the Midwest and the New York City area. Founded in 1920, their "sliders" originally sold for 5 cents, and were only 10 cents into the 1960s.