Being too serious can cause stress, anxiety, worries and failure.  Success comes with a lot of factors and being too serious over just one factor, you might overlook the others.  We need to smile at times, laugh a little, and have a break.  This will help us overcome stress from work so that we can handle our problems or pressures in a light manner.  It is easier to think when we are not under stressed and do our jobs well.

The whole point of this is not trying to say that we should not treat our work or other things seriously but we just need to lighten up ourselves.  We need to lighten up our mind so that we can function well.  There is nothing wrong if a top executive of a company joins his/her employees to a one night of fun.  If doing it is too much already, well, a simple smile under a load of pressure can lighten up not only their feelings but yours as well.