In 1985, which famous brand made the controversial decision to change its flagship product's formula, resulting in massive consumer backlash and eventual return to the original formula just 79 days later?

Throughout history, even the most successful companies have experienced product launch failures. These missteps have become legendary case studies in what NOT to do when bringing a new product to market. This poll tests your knowledge about one of the most infamous product failures in retail history - a case that's now taught in business schools worldwide as a cautionary tale of market research gone wrong.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Coca-Cola (New Coke)
Pepsi (Crystal Pepsi)
McDonald's (McLean Deluxe)
Kellogg's (Breakfast Mates)