In some relaxed situations, if the joke is poked, he will have a big laugh, if just to deal with some, do not feel funny, there will be intermittent laughter. In expressing true approval and acceptance, smiling and nodding at the same time shows that he coincides with the other person's ideas, and if the listener shows a brief smile in the course of obedience and twists his face like the other side of his face, it shows that his inner thoughts are not what the speaker says, nor is it the same as the apparent smile.