Laughter is one of the special aspect of human being. There is no doubt that, Lot of feelings arises while laughing. Laughter brings attraction or enmity on others depending upon the situation. we should not laugh when others are in trouble, that will create problem as other might think we are not taking care of them and making fun of them.So we have to laugh politely as per the situation. The author mentions how Lord Vishnu looses his strength due to non stop laughter. This story is mentioned in Vedas , Comes during Soma Yaga explaining Pravarykyam Yaga Utpathi. Laughing is a good exercise which helps in reducing the sickness, But it should be to the limit on some situation.