Mt Dew. It was the breakfast of champions when I was working my way through college. Now I can barely drink pop. I think I ruined my gut drinking way too much of that stuff.
My favorite one is the Rockstar + Guava. It's the only one I can drink a lot of at any given time (which is important when you need to be awakened from the dead!)
that shit is so bad for you. i used to drink Monster a lot, especially the one w/ the red and silver color scheme. mostly cuz it had the least offensive flavor. i was also really impressed by how good their coffee energy drinks turned out but after a while i started being grossed out by drinkin them. they just taste SO unnatural and like. i can feel the acidity wearing away at my teeth.