OK, after getting my peepee slapped here, I will not go on about "YOUNGER" people and their "UNUSUAL" ideas.
So there, blasted chipmunk, yes indeed those quills can be shot up to twenty yards by a cornered porcupine. Be very cautious if he turns his back to you, that means he is about to launch a salvo of quills. They strike with about the same force as a .22 cal LR bullet, and typically penetrate about 2 inches of unprotected flesh. Once in your skin, they slowly eat their way further into your body, and travel in your bloodstream up to your brain, where they are usually fatal. Same as the .22 cal bullet that enters your wrist and travels to your brain.
Doug