Seems like this happens from time to time, the packages should perhaps be better labeled for the slower "personal trainer"-type crowd.
When i was 17 i chewed up 8 no doz tablets (the better part of 2 grams) and hopped in my car and drove to the bookstore. By the time i pulled in to that parking spot it kicked in and i felt extremely panicked, heart racing, dizzy, sweating hands were visibly shaking strongly and uncontrollably so I said fuck this I can't go in there. I immediately backed out and boom I hit a car behind driving in the parking lot. I get out and its some black lady (actually quite attractive) and she's freaking out saying she doesn't have insurance and then suddenly gets back in the car and leaves. Of course it was all my fault, I was so disoriented i just backed up without looking. Odd to think that what I took was, based on what happened to this personal trainer guy, 1/5th of a lethal dose of caffeine.