Which historic advertising slogan from the 1940s was created during WWII but was never actually used in published advertisements during the war, only becoming famous years later?

Before the digital age transformed advertising, certain slogans became so iconic they shaped consumer culture for decades. These phrases didn't just sell products—they defined eras, influenced language, and created lasting brand legacies. This trivia explores one of history's most groundbreaking advertising slogans that revolutionized how companies connected with consumers. Test your knowledge of advertising history with this challenging question!

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"Keep Calm and Carry On" (British Ministry of Information)
"We Can Do It!" (Westinghouse Electric)
"Is this trip really necessary?" (Office of War Information)
"When you ride ALONE you ride with Hitler!" (U.S. Government)