i have a.d.h.d., and a severe case of insomnia, and some caffiene addiction to boot. the first two i've had for a while, but the caffiene addiction occured when i boiled down 6 of those 16 oz. cans of bawls EXXtra into 8 fluid oz. (equivalent to almost 4 grams of caffiene!) and hallucinated for two hours, and lost track of approximately 37 hours of my life, and woke up on my roof with innumerable bruises and severe thirst, hunger, and a headache to boot. But i had the wierd feeling of satisfaction... and that i should never attempt such a thing again... side effects i was aware of were loss of privelages for two months, and the destruction of several objects in the garage, including the barbecue grill, shovels, bikes, and the fridge...