Anything you do, burns calories. Even while you are sleeping you are burning calories.
A hearty guffaw will burn more calories than a nervous titter, but researchers at Vanderbilt University found adults burn an average of 1.3 calories per minute while laughing with their friends. That’s about the same number of calories you burn while taking notes in a classroom or standing and talking on the phone. But laughter has other benefits besides burning calories, including relief of emotional stress and a workout for the muscles of the diaphragm, abdomen, back, and shoulders. Read about the benefits of laughter from the Guide to Stress Management at About.com