10 Most Intense Business Wars Ever

Burger King started launching direct attacks on McDonald's after it was bought by Pillsbury in 1967

Like Coke and Pepsi, these two fast food giants have frequently traded gust for decades, though much of the elbowing was done without direct attacks. Instead, they used product development and market position to fight the war. In 2009, Burger King tackled McDonalds with more head-on relative marketing. BK's Whopper Virgins promotion put the two brands' marquee products, the Whopper and the Big Mac to a taste test by people in distant places around the world. It curved out to be a huge failure, but not because of a reaction from McDonalds. The public saw the ads as abusive and chauvinistic.