Make an effort to be humorous throughout the day. Not only is it beneficial from a physical viewpoint but it diffuses tension in difficult circumstances and creates an excellent atmosphere wherever you are. It was recently reported that members of the Tauripan tribe of South America have a ritual where they awake in the middle of the night to tell each other jokes. Even tribesmen in the deepest sleep wake to enjoy the laugh and then return to their state of slumber in seconds.