#6: Coca-Cola Replaced Coke With New Coke
In 1985, Coca-Cola decided that the best response to Pepsi’s growing popularity was to alter the formula of one of the world’s most recognizable products. Taste tests suggested consumers preferred the sweeter New Coke, but executives badly underestimated emotional attachment to the original. Customers revolted. Calls flooded headquarters, people hoarded old bottles, and the company restored the original formula as Coca-Cola Classic after only 79 days. The fiasco became marketing legend—even though Coke ultimately emerged stronger from the uproar.

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