Which iconic advertising slogan was created after a marketing executive noticed travelers writing 'OK' with a check mark on travel documents, inspiring a billion-dollar campaign?

Advertising slogans can define a brand and become cultural touchpoints that last for decades. Behind many iconic taglines are fascinating stories of marketing strategy, creative breakthrough moments, or responses to business challenges. Test your knowledge about the origins of some of the most influential advertising slogans that transformed product perception and market positioning.

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• Nike's 'Just Do It'
• Apple's 'Think Different'
• McDonald's 'I'm Lovin' It'
• Mastercard's 'Priceless'

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