Sometimes your joy is the source of your smile, but sometimes your smile can be the source of your joy. It's no wonder that a hearty bout of laughter feels good. According to research studies, a good laugh increases your blood circulation, works your abdominal muscles, raises your heart rate and gets the stale air out of your lungs. It strengthens the immune systems as well. Laughter also gets creative juices flowing, helps in problem solving and smooths the way during difficult times.
Laughter is contagious.
Nobody ever died of laughter. Babies start laughing at two or three months and their rate of laughter picks up steadily until the age of six or so, when the average child laughs 300 times a day. Adults laugh between 15 and 100 times a day. If you want happiness for a day - go fishing. If you want happiness for a month - get married.