Laughter is the Best Medicine , this is completely true but why , Lets see benefits of laughter : 1- Lower blood pressure 2- Increase vascular blood flow and oxygenation of the blood 3- Give a workout to the diaphragm and abdominal, respiratory, facial, leg, and back muscles 4- Reduce certain stress hormones such as cortisol and adrenaline 5- Increase the response of tumor- and disease-killing cells such as Gamma-interferon and T-cells 6- Defend against respiratory infections”“even reducing the frequency of colds”“by immunoglobulon in saliva 7- Increase memory and learning; in a study at Johns Hopkins University Medical School, humor during instruction led to increased test scores 8- Improve alertness, creativity, and memory