answer:Laughing is healthy: Lower blood pressure Increase vascular blood flow and oxygenation of the blood Give a workout to the diaphragm and abdominal, respiratory, facial, leg, and back muscles Reduce certain stress hormones such as cortisol and adrenaline Increase the response of tumor- and disease-killing cells such as Gamma-interferon and T-cells Defend against respiratory infections–even reducing the frequency of colds–by immunoglobulon in saliva. Increase memory and learning; in a study at Johns Hopkins University Medical School, humor during instruction led to increased test scores Improve alertness, creativity, and memory So there is a decided purpose to it, it makes us feel better.