If you are off your rocker this chap has a "how to" guide, so you can try it yourself. Assuming a) you can get hold of a laser-etcher and a helpful operator, b) you can defeat the safeties on the machine designed to stop you doing this and c) you're a total nutcase. Because doing this cooks your skin, frying small parcels of it into vapor. It's basically digital branding, and it exposes your body to massive amounts of laser energy. And it hurts. (From Gizmodo)