Give a gum to one of two identical Twins...watch from 0:56 the experiment how chewing gum (properly) play the face muscles to look happier, friendlier and even more sexy! My personal take: 1. It is a commercial, they wanted to create a contrast so the other twin had to put an unhappy expression. Nevertheless, it is a good reminder how are we perceived when we are too serious or unhappy. 2. The amazing power of smile to the way people perceive us.