Longman English Dictionary, laugh is "To make sounds with your voice and more you face because you think that something is funny." I believe that laughter is the easier way to make you are happy. First of all, Laughter can reduce stress. Longman English Dictionary, stress is "Continuous feelings of worry about your work or personal life." You can reduce your stress by laughter. If you stress about your work, you burst out laughing with a colleague, and tell a funny joke. It can make reduce your stress , so you are happy. According to some recent research published in the Archives of General Psychiatry, Laughing reduces tension and stress, and lowers anxiety and irritation.