Coca-Cola faced significant competition from Pepsi-Cola, prompting a rebranding effort with the introduction of 'New Coke,' formulated to meet changing consumer preferences. Despite favorable taste test results, the move was met with public backlash, resulting in the eventual discontinuation of New Coke and the return of the original formula as 'Classic Coke.' This incident showcased the importance of brand loyalty, consumer emotions, and the risks of imitating competitors.