Once a wise man got himself into a critical Life and Death situation. The guy holding a sword standing beside the wise man to cut his neck off offer him a chance to get his Life back by saying that, he would let him go free if he write just 1 line sentance on the wall which holds the power to make the (sad person Happy), and the (happy person Sad). Wise man accept the offer, thought for a moment and write this ! And Walks Free!!