Which retail advertising campaign delivered the highest documented ROI, generating $8.4 billion in additional revenue from just $215 million in advertising spend?

In the competitive world of retail, advertising campaigns can make or break a brand. Some campaigns become legendary for their impact on sales, brand perception, and even cultural conversations. This trivia question focuses on one of the most financially successful advertising campaigns in retail history that fundamentally changed how companies approach marketing ROI.

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Nike's 'Just Do It' campaign (1988)
Apple's 'Get a Mac' campaign (2006-2009)
MasterCard's 'Priceless' campaign (1997)
Old Spice's 'The Man Your Man Could Smell Like' campaign (2010)