you guys are caffeine n00bs
you all realize that consuming so much caffeine will weaken the effects, so you will need to drink more and more.
also an 8oz cup of coffee has on average between 100 and 135mg of caffiene, most caffiene pills are either 100 or 200mg. If you consume 250mg you will experience caffiene intoxication which pretty much just overstimulates your central nervous system, keeps you wired, causes restlessness, in some cases nausea, diarrhea, "shaking" etc...
generally 13 grams (thats a fuckton of caffeine) is the lethal dosage of caffeine for the average adult. (and if you can orally consume that much caffeine in one time, then you deserve to die)
Caffeiene is a mild amphetamine, it is addictive and stimulates the brain the same ways as all amphetamines, it attaches to the the adenosine receptors in your brain and prevents the normal adensosine from attaching (which causes drowsiness) and it also causes your adrenal glands to produce extra ammounts of epinefrin (gets your adrenaline going)
PS: Caffeine abuse can lead to both heart attack and stroke