The Curious Case of the Giggles.

Laughter.

This sudden feeling of joy is inexplicable and goes as soon as it comes.  Often times people laugh and do not know the reason for the laughter.

Why do we laugh?

Laughter is a social tool used to strengthen relationships and comedy is often used to lighten up a mood in bad scenarios.  It is an experience that can not be enjoyed alone, but has to be shared.  Here are a few links describing why this happens.

http://science.howstuffworks.com/life/laughter1.htm

http://www.psychologytoday.com/articles/200011/the-science-laughter

Ted talk describing how comedy is used to communicate: