The BIG MAC turns 40 today.
The Big Mac was invented in Uniontown, Pennsylvania by Jim Delligatti and introduced on August 22nd, 1967. Customer response around there was so good that it rolled-out nationally in 1968. According to a famous advertising jingle, it consists of "two all-beef patties, special sauce, lettuce, cheese, pickles, onions on a sesame seed bun," though the most distinctive feature is a middle layer of bread used to stabilize contents and prevent spillage.
Interview with Jim Delligatti on You Tube