The bullet proof coat
A clever young man came to a seasoned general one day."Please, sir," said he,"I have invented a bullet proof coat. It will be a boon for soldier in the field of battle."The general examined the coat very carefully. But nothing unusual came to his notice. He asked the young man to put it on, and went in to fetch his rifle. He wanted to shoot at the inventor in order to test his claim. But when he returned with it, the young man had disappeared. He smiled at the cleverness of the visitor and said,"He knew that his coat was a boon for all,except his own self."