This harrowing picture shows an x-ray of a 15-year-old boy's skull after a five inch knife was plunged into his head. Amazingly the teenager survived the stabbing and ten months on from the attack has enrolled in college. The boy and two other youngsters were attacked when they tried to stop a friend being robbed at a bus stop in London. The muggers used a kitchen knife to stab one boy in the forehead, another twice in the back and a third in the shoulder. He survived because he was rushed to hospital with the knife still sticking out of his head and doctors managed to operate in time. Surgeons said if anyone had tried to take it out he would have died.