Laughter is magical especially when you haven't experienced it in a long time.  It is something we express out loud when we are tickled or see something funny.  The sound of your own laughter can change the direction of a bad day and lower your stress levels tremendously.  Laughter is contagious and can infect anyone who hears it.  Laughter is a social indicator that let's others know when you have a positive emotional reaction to some event or humorous sarcasm, irony, or word play.  When was the last time that you laughed at yourself?