Actually Wlado, I didn't explain that the hair has to be fresh, with a root attatched. This happened to a friend of mine - a hair dropped down his collar and lodged against the waistband of his underpants, and over a period of weeks, grew into the skin on his back. Surgery was required to 'excavate' an alarmingly large area into which the hair roots had grown, so it does happen, albeit rarely, which from my friend's graphioc description of the pain involved, is no bad thing!