Laughing out for health

Recent researches suggest that laughter influences more than our mental framework, it actually has a positive effect on the physical aspect as well. It has been widely accepted, for some time, that laughter increases the pain resistance level, but the theory is still not proven. In fact, very few studies have yet been made about the relation between comedy and health, but those existing seem to indicate that a good joke may lower the blood pressure, improve memory and cognitive functions and boost the immune system. Moreover, these results are not short-term only: it seems that a good sense of humor may protect you against heart diseases and alter your biochemical state to a level where the organism produces more antibodies.

http://www.aworldofgoodhealth.com/articles/laughter-for-health.htm