Studies have also found that dominant individuals -- the boss, the tribal chief or the family patriarch -- use humor more than their subordinates. If you've often thought that everyone in the office laughs when the boss laughs, you're very perceptive. In such cases, Morreall says, controlling the laughter of a group becomes a way of exercising power by controlling the emotional climate of the group. So laughter, like much human behavior, must have evolved to change the behavior of others, Provine says. For example, in an embarrassing or threatening situation, laughter may serve as a conciliatory gesture or as a way to deflect anger. If the threatening person joins the laughter, the risk of confrontation may lessen.