Love this one. From my experience, the right kind of humor acts as a lubrication to ease the friction, whether it's friction within family, community, work or society.
In the Yoga classes I share with our students, I have been sharing this practice of group laughter as an integral part; usually at the end of the session, I insist that everyone take few minutes (at least 10 mins) of deep relaxation in shavasana. At the beginning of the shavasna, we all start in happy-baby pose (with knees close to heart, lying down like a happy-baby) and start to move the legs and hands as if riding a bike or elliptical machine with hearty-group-laughter. My experience has been this is not just great for the core strength at the physical level, awesome to build a strong group camaraderie as well. I have seen this transform the laughter into beautiful smiles on everyone's face as they awaken from deep relaxation in shavasana.
Few other personal stories smile-up, hope to share them at another time, for now saving them smilingly :-)