Starbucks, 1971
The first Starbucks was opened by University of San Francisco grads Jerry Baldwin, Gordon Bowker and Zev Siegl in 1971 in Seattle, and just sold coffee beans. This all changed when Howard Schultz came on board who, inspired by Italian coffee culture, turned Starbucks' coffee shops into the social meeting places we know today when he bought the chain in 1987
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It also became a soft drink by accident. One day someone walked into Jacobs Pharmacy with a headache and needed a bottle. It was originally intended to be mixed with water before drinking. He didn't want to wait to get home and asked for it to be mixed at the soda fountain there in the drugstore. The tap was down at the other end of the counter, so the man behind the counter just mixed it with soda water. The result is what we know today.
More trivia: In Chinese, "Coca cola" translates to "Bite the wax tadpole."