It is incredible how laughing together can help people and teams work together. It is not a coincidence that leaders take their teams out to programs in which they do funny things together (or challenging things), because fighting obstacles, winning, and laughing together, makes us connect in a very different way, and in a way that makes it easier to work together in a normal office setting or elsehow.
In other words, we need to have fun together and laugh together, not only with companions at work, but also with our kids, spouse, and families.