Guys, yes, the dots mean different types of "flavors" of redbull, but it is only because of one thing: the production of it. When the producers of redbull make redbull in the factories, they are stored in huge (who knows how many gallons) bins, and when these bins sit over time, the sugar settles at the bottom and the caffiene rises to the top. When the final product is distributed to different cans, they have to mark different colors that are color coordinated to where that particular "flavor" was located in the bin. So for instance, the bottom, since it has the most sugar, lets say they put a lime green dot on the bottom. All of the lime green dot ones are going to have a lot of sugar. And let's say the ones from the top with the caffiene have a light blue dot. This means the can with the light blue dot has a tad more caffiene than normal redbull. Trust me, I have been told by a friend who went to one of these "factories" and ever since, all i drink are redbull cans with lime green or dark blue dots on the bottom since i seem to get the most energy out of those colors.