As soon as one speaks a foreign language, the expressions of the face, the hands, the language of the body change. We are already someone else.
Not so long ago, I worked in an American School during a summer camp. It was a very interesting ethnic experience. Even if students came from all over the world, the American spirit of this school reminded me of a famous movie for teenager. Thanks to the super motivated teachers (or counselors), the kids were acting, singing, dancing, creating, or just having fun while learning a way of living.