There is probably no more effective stress relief than laughter. Funny movies and videos, stand-up comedy, and humorous books, articles and television programs produce deep hearty laughter that can help relieve stress and, as a result, improve the functioning of your immune and endocrine systems. Clearly then, laughter is of enormous value for your whole being—body, mind, and sprit. So as often as possible, try to have a belly-rocking, thigh-slapping, tears-rolling laugh.

— from Golden Rules for Vibrant Health in Body, Mind, and Spriti by Joseph J. Sweere, D.C., Basic Health Publications, 2004