I bought a six pack of these in high school and saved them for the night before a big exam:
http://en.wikipedia.org/wiki/Jolt_Cola

Then I drank a few Jolts and felt sick... it was a pretty dumb plan. I never tried Red Bull or 5 Hour Energy as an adult, b/c I didn't have a good experience with Jolt. For some reason though, I have fond memories of the Jolt brand.

Did you ever drink Jolt Cola?