I have a four or five inch scar on the bottom of my left arm, near the elbow. I actually got it from a screw sticking out of a staircase, but I frequently tell people it's from a Vietcong bayonet, then launch into a practiced war story that gets more glorious with each retelling (presently, I was captured when the rest of my platoon was destroyed, sharpened a bamboo stick over months with my teeth, and took out the patrolling guards by going for the jugular. It continues, but by now people have tuned me out).