In commercials, you always see people laughing. This is done for a reason: the more a person smiles, the more atractive the person becomes, and the more attractive the product becomes that is presented in the commercial.
Smiling people sell better, thats an old saying in the creation of commercials. The faces on the covers on the magazines in the kiosks look with a laughing face at the costumers, trying to get their attention. A human face plus a laugh is an old sales trick. Even the classical music industry uses this rule. On cd covers of classical music cd’s and dvd’s we often see a singer or conductor smiling.
Laughing, what does it mean and why cant we do without it? If you look from a distance to people who are cheerful and observe their bodylanguage, then it takes notice that a laugh is a remarkable expression: the eyes become little wrinkles, the mouth opens up to become a huge whole. The shoulders move up and down and often laughing people bring their hands towards their faces. Apart from this, laughing gives us a good feeling, it works in a relaxing way, it lowers stress levels and it can even prevail that we get infections.
So in a nutshell: laughing is really healthy and it is liberating. Duchenne, a pioneer in facial expressions, calls the laugh the sweet emotion of the human soul.