Coca-Cola BlāK 

2006-2008

Coca-Cola spent two years developing this soda- coffee concoction, in the hopes of tapping into the growing premium coffee market. The beverage was launched in 2006 and was aimed at adult consumers, more specifically »the over-30, savvy, sophisticated achiever.« Coca-Cola never explained why the drink flopped other than that it might have been the taste. It was described as »an adult Cola taste,« which was perhaps not for everyone. The story of BlāK shows us that even for gigantic corporations, with enormous resources and deep consumer insights, failure is always an option.

Update: Coca-Cola has recently re-launched a very similar drink. Due to evolving trends and palates, the company thinks the public is ready. Ready to appreciate Bläk. The new drink is called Coca-Cola Plus Coffee and is already available in some countries.

Additional info:
Wikipedia
CNN.com – Coca-Cola thinks Americans are finally ready for Coke with coffee.