When Wojo gives the car keys to Miss Shawcross, he says to her "Happy Motoring." This was the slogan used by subsidiaries of Humble Oil Company for decades before the company became part of Exxon in 1973. Humble, which itself was part of Standard Oil of New Jersey, operated under its own name as well. Esso and Enco in various parts of the U.S. The "Happy Motoring" slogan played off the company's mascot Happy the Oil Drop Man, whose head was shaped like a drop of oil. The company also used the slogan "Put a tiger in your tank" beginning in 1964, which Exxon continued using for years after acquiring Humble Oil.