97 percent of employees believe that it’s important for managers to have a sense of humour, according to an HR study by consulting firm Robert Half International.
* The other 3 percent were probably fired by managers and aren’t going to be swayed by humour.
Laughing and smiling helps to alter our mood and perspective. It decreases stress hormones, provides a full-scale workout for your muscles and increases our immune systems and blood flow. A sense of humour demonstrates self-awareness, that you know your flaws and are therefore possibly empathetic to others.
Taking yourself too seriously limits your perspective, learning and can create stressful situations or make you unpleasant to be around. (Basically like every dodgy world leader.)
http://coolfidence.com/7-reasons-why-you-should-learn-to-laugh-at-yourself-solution-20042