Chocolate flavored sodas are old hat. Canfield's has one, and Shasta and Diet Rite used to have one as well.

There was something called Chocola, I'm not sure if it was a soda or a yoohoo like product.

Wal-Mart had a chocolate soda in their chubby kids sodas a few years ago, and Coke had chocolate flavor packets to mix in 20oz sodas. People also put chocolate syrup in Coke to make a chocolate Coke.