"The Sip Test Lie – Why people buy brands not flavors" dissects the biggest marketing blunder of the 20th century: the launch of New Coke in 1985. Coca-Cola, terrified of losing market share to Pepsi, conducted 200,000 blind taste tests. The result was clear: People preferred the sweeter taste of New Coke. They launched it, and the world hated it.

Marketing strategist James Fizz explains the flaw in the data: The "Sip Test Bias." In a single sip, people prefer the sweeter option (Pepsi/New Coke). But when drinking a whole can, that sweetness becomes cloying. More importantly, Coke ignored the emotional bond customers had with the original brand.

"The Sip Test Lie" is a textbook case on the limits of data. It teaches businesses that logical research cannot measure emotional loyalty, and that destroying your heritage to chase a competitor is a suicide mission.