When your brain gets the joke....
Interesting article about where and how we get the joke. Humor may be what separates us from other animals. (Although I think animals get physical humor, in their own, critter way. And it varies among types of animals.)
http://www.newscientist.com/article/mg20527451.400-the-comedy-circuit-when-your-brain-gets-the-joke.html?full=true#bx274514B1
http://www.newscientist.com/article/mg20527451.400-the-comedy-circuit-when-your-brain-gets-the-joke.html?full=true#bx274514B1