If you can find Jolt in your area, it comes in this new "Battery bottle" that is a metal spraypaint can with a screw top. That stuff has some kick, my favorite is the Blue cuz it's the best blue soda ever. Jolt has lots of caffine which tends to be counteracted by the sugar low you experience.
Then there is the green one, Jolt "Energy" which has "no carbs, no calories, just kick." Spelnda, Taurine, Ginsing and Caffine. Kinda tastes like Mt Dew and has citric acid in it to quench thirst. The first time I drank half a bottle of this stuff I thought I was going to explode. I started babbling incoherently and rapidly and couldn't settle down for almost an hour. Which is suprising because I never react to anything like that cuz I'm a big, slow, ponderous kinda guy.
Worth trying it though.