Jimmy Carr's Horizon documentary special "Jimmy Carr & The Science Of Laughter" explores the science behind laughter and comedy. It features interviews with scientists and comedians, as well as experiments and demonstrations to illustrate the different aspects of laughter. The documentary covers topics such as: * The different types of laughter and their physiological effects. * The role of the brain in laughter and how it processes humor. * The evolutionary origins of laughter and its social functions. * The psychology of humor and why we find certain things funny.