Brick

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 a while 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.