I honestly can't figure it out, so I hope I don't feel too stupid when I find out the answer.... A man and his son are driving in a car one day, when they are hit by a drunk driver. The man is killed instantly. The boy is knocked unconscious, but he is still alive. He is rushed to hospital, and will need immediate surgery. The doctor enters the emergency room, looks at the boy, and says... "I can't operate on this boy, he is my son." How is this possible?