Cause it lifts your spirit up and makes you feel good and it helps you fight illnesses like depression, when you get sick you feel 20 times better when your laughing than when your just there moping around even though your sick..laughter also can make your day all better and such
Laughter is great exercise for the core of your body and it's been shown to cause chemical changes in your brain decreasing the symptoms of depression. It can help to alleviate stress and it generally makes whatever you we're worried or upset about seem less important and improves your over all mood. It really is the best medicine.
They Say That There Is A Thin Line Between Love and Hate; Anger and Laughter. Both These Emotions A f f e c t The Body. Laughter Has A Positive One and People W h o Do Prof I t Much. ==================== http://www.helpguide.org/life/humor_laughter_health.htm ====================