A man was walking in the street when he heard a voice: "Stop! Stand still! If you take one more step, a brick will fall down on your head and kill you."
The man stopped and a big brick fell right in front of him. The man was astonished. He went on, and after awhile he was going to cross the road.
Once again the voice shouted: "Stop! Stand still! If you take one more step a car will run over you and you will die."
The man did as he was instructed, just as a car came careening around the corner, barely missing him.