Check out websites compeating with red bull and they ushally give you a red bull and their energy drink to compair them.
I don't know how's your countries system. But in Malaysia, we would have a Ladies Night once a week, and all the ladies would get free drink. If you come to Malaysia, you might get one free..
Go to the University of Texas at Austin. The Red Bull models/car drive up and down the streets everyday giving away free red bulls. I've never bought a single red bull but I consume a can at least once a week!
By buying one