Which 1980s product launch is considered one of history's biggest marketing failures, where a company reformulated their flagship product only to face massive consumer backlash and return to the original formula within 79 days?

Throughout history, even the most successful companies have experienced dramatic product launch failures. These historical missteps often provide valuable lessons in product development, market research, and consumer behavior. This trivia question explores one of the most infamous product launches in retail history - a case study that's still taught in business schools today as an example of what happens when companies don't properly understand their customers.

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New Coke (1985)
Apple Lisa (1983)
Colgate Kitchen Entrees (1982)
McDonald's Arch Deluxe (1996)