Why do people laugh? (From the Economist) “Laughter is very contagious and this suggests that it may have become a part of human behaviour because it promotes social bonding. When a group of people laughs, the message seems to be ‘relax, you are among friends.’”
Update: Dave Winer says (and I agree): “Most laughs can be translated into this simple statement: Ain’t it the truth! When we laugh it’s because something is so true (for us) in such a deeply felt way that our body erupts. When we laugh together it’s because we share that feeling.”
