Staying calm when someone is angry at you will make them feel ashamed later, even if they get angrier in the moment. Chewing gum or eating when nervous tricks the brain into feeling safe since it thinks you wouldn't eat if in danger. People are more likely to agree to small favors if they first deny larger requests, as it improves their mood. Smiling can make you feel happier by causing happy emotions through facial expressions. Taking a first date somewhere exciting makes them associate that thrilling feeling with you.