There was a nervous boy who was constantly losing his temper, and his father brought him a bag filled Withwith nails, and he said to him: "My son, I want you to hammer a nail into our wooden garden fence every time you get a wave of anger Andand you lose your temper". So the boy began to implement the advice of his father .... On the first day he hammered 37in thirty-seven nails, but it was not easy to insert the screw into the fence.