What's So Funny?

I laugh like my Dad. Why in the world would I copy a laugh? I can see adopting a walk. I understand mimicking a handshake. Why pick up an awkward, and a bit out of control sound?

Laughing just doesn't make sense. Why make the same sound when nerves tickle as when Andre the Giant says, "Give him a break, he's been mostly dead all day" while holding doll like Dread Pirate Roberts/Farmboy Wesley's head so he can see Indigo? I can't decide which produces a larger response. A mystery that doesn't matter to be sure. 

One of my favorite takes on Jesus depicts him with his head thrown back in the grip of a laugh. The Bible paints God laughing at the nations lined up against him. The idea of trying to take down God is as comical as Dread Pirate Roberts out wrestling Andre. (That only happens in the movies by the way.). What else elicits a chuckle from God?  Maybe a son who laughs like his Dad.