Happiness is not just about laughing it is also about knowing how to laugh at yourself.
We are all human and sometimes we fail to see that life is really fun and take everything too seriously. Next time you feel the world is against you, take a step back and relax. Realise that you are a perfect human being possessed of unlimited potentiality. Think of the most serious challenge confronting you and laugh.
Right from the solar plexis. After you have laughed a while, address the challenge again. Be amazed that it already is less of a challenge than before and is just another stepping stone in the journey of life.