Diet Coke
Diet Coke (called Coca-Cola Light in some countries) is a sugar-free and no-calorie soft drink produced and distributed by The Coca-Cola Company. It contains artificial sweeteners instead of sugar. Unveiled on July 8, 1982 and introduced in the United States on August 9, it was the first new brand since 1886 to use the Coca-Cola trademark. The product quickly overtook the company's existing diet cola, Tab, in sales.
New Coke
Pepsi-Cola took advantage of the situation, running ads in which a first-time Pepsi drinker exclaimed, "Now I know why Coke did it!" Even amidst consumer anger and several Pepsi ads mocking Coca-Cola's debacle, Pepsi actually gained very few long-term converts over Coke's switch, despite a 14% sales increase over the same month the previous year, the largest sales growth in the company's history. Coca-Cola's director of corporate communications, Carlton Curtis, realized over time that consumers were more upset about the withdrawal of the old formula than the taste of the new one.