First of all, that we be humorous is a good about yourself. We can make the people around us happy with us. When a person is in the range in a bad mood. We can listen to their problems easily. Then take them to relax by the fact that we smile, tell a joke, play jokes to make him laugh. This is beneficial to both US and him. You try to think as if waking up in the morning, then we frown talk will you be happy? Is unhappy. But if we smile at them early in the morning is when good day morning to find good things.