SPR

Don’t walk across a ballroom floor swinging your arms. Don’t talk or laugh loud enough to attract attention, and on no account force yourself to laugh. Nothing is flatter than laughter that is lacking in mirth. If you only laugh because something is irresistibly funny, the chances are your laugh will be irresistible too. In the same way a smile should be spontaneous, because you feel happy and pleasant; nothing has less allure than a mechanical grimace, as though you were trying to imitate a tooth-paste advertisement.