Crack in a can

energy drinks wake us up, give us energy to help us get thought the day, but that energy drink only lasts so long, after a bit the energy is gone and all were left is with the crash. but some times, like when were playing a sport or something like that we just dont crash, which makes me think. is most of the energy in our head, people belive a lot of dumb things, i mean our parients thought that a rock was a good pet( now come on). so i wonder if a lot of the energy is just our own body keeping us going.