Which viral marketing campaign achieved an estimated 6,500% ROI, turning a $15,000 investment into approximately $1 million in revenue?

In the fast-paced world of digital marketing, viral campaigns have transformed how brands connect with consumers. Some campaigns have been so successful that they not only boosted sales dramatically but also became cultural phenomena. This trivia question challenges you to identify a groundbreaking viral marketing campaign that redefined industry expectations and set new standards for ROI in digital marketing.

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Blendtec's 'Will It Blend?' YouTube series
Old Spice's 'The Man Your Man Could Smell Like' campaign
Dollar Shave Club's launch video
Spotify's annual 'Wrapped' personalized playlists