I jumped on a chainlink fence to break up a dog fight and hooked the triangle part under my ribs. My chest swelled double on that side. I had to sleep sitting up for 4 days. I couldnt drive open doorsift a gallon jug of milk or even turn without going through the roof. Years later that side has always stayed bigger. Never went to the doctor and im fine. But ive always wondered if i just popped the cartridge or maybe cracked it. Ive actually torn the cartridge from my ribs before on the same side but it just didnt hurt this bad.