This can help people with emphysema and other respiratory illnesses. Laughter can help in clearing mucus plugs. Stimulation of the immune system. One researcher found that watching a humorous video caused an increase in interferon-gamma both during and after the laughter experience. Sharpened mental functions.
Jokes require attention.
Word-plays can keep the mind busy. Humor can stimulate the release of adrenalin and electrical activity within the brain. Laughter makes it easier to work hard comfortably. Improved ability to organize information. Laughing together is a bonding experience.