How it's done

River currents aren't supernatural or happenings that can only be explained be "nature". It actually has an easy explanation. If you were to follow the river to the end (upstream). You would find a herd of caffeine crazed beavers. The caffeine comes from a local soda factory and they spill the waste into the river. The reason the river isn't soda filled when it gets to you is because the beavers drink it all up. This is what creates the rivers current. They're swimming up stream to drink this caffeine filled soda and the back draft (via water) is the current that you get down stream. NOW YOU KNOW! ( props to bill nye the science guy )