Basically more sugar. Added energy supplements that will kill you after they wear off, and you will crash like a mother fucker. Honestly, just drink some green tea or something. Will do the same thing. I can see how the energy drinks can provide a little better tasting alternative then coffee and tea though. But really, most the kids I see that drink them, think they are hard because of it. Meh.
They have 23 grams of sugar per serving, which is less than root beer or mountain dew, or most sodas for that matter. And they say they add a lot of stuff to them (taurine and ginseng etc.) but the amounts are so negligible that they don't have much of an effect on you. I've never really gotten a crash after drinking one, they only actual effect I've noticed is not being able to fall asleep. But they probably affect other people differently.
so i took a PHATY shit and flushed and to my surprise it just clogged worse and started overflowing and so i was tryin to clean that shit up but cut myself on a sword that i keep hanging over the toilet. at this point i completely lost it because my cat just died so i smashed the FUCK out of my toilet with this dwarven sludge hammer thats also hanging in my bathroom and now my bathrooms kinda flooding but FUCK it im gonna go get some taco bell LATE