Subject: Twin babies giggling to each other - 50 million views
Get an idea of the joy in other realms when you watch this
http://www.youtube.com/watch?v=X7mOzWQSnaQ&feature=related
and here's two different babies a little older with translations of their conversation on ellen degeners
http://www.youtube.com/watch?v=ocjWFGIQr3s&feature=related