Happiness for humans last the longest when shared with others. For one can be happy listening to some entertainment by themselves but when one is in the company of others those shared feelings last a whole lot longer.  Achieving a goal for oneself lifts you up but lifting the weights together or with a loved one watching keeps them a float and flying high. We as humans need to have that bond with another to achieve a happiness that holds over-time. That is why we go to concerts, sporting events, groups that share with our common interest and love. Happiness can occur alone but when together it adds a flavor that tastes so much better.