I swore off energy drinks in high school after someone brought a case of them on the bus to a football game and I drank one and got horrible diarrhea and had to shit in the woods at halftime.
the bang drinks even used to have creatine in them which would actually make you sick if you didn't have anything to eat around the time you drank it. they have reformulated. so wouldn't it surprise me if the bang people were putting some weird stuff in there that was basically acting as a laxative. I have no idea.
pounding 300 mg of caffeine a can tho... as a 10+ year recovering veteran of the ephedrine caffeine stack, it's territory I don't ever want to get into again.