I’m a complete sucker for this kind of thing. It’s the most beautiful sound in the world.
The classic: http://www.youtube.com/watch?v=cV9PZk8ojF0
This one purports to be the “best ever”: http://www.youtube.com/watch?v=-wIEihDAcpU&feature=related
Oh, man, I needed to see those! 
Tom
i have a friend who’s a 40 year old version of that kid and I swear their laugh is the same.
That was fun! one of them led me to ‘Mocha and His First Broccoli’ which was hysterical…
I was reading ‘Mind Wide Open’ (sorry, don’t have the author’s name) and he devoted a whole chapter to tickle-play between parent and child, and bonding, and laughter. Good book.
Thanks for the links!
Tyg
http://www.youtube.com/watch?v=K-RVvQbX0dk
http://www.youtube.com/watch?v=I5ALIL7T764&feature=related
No matter who you are or what mood you are in, a baby’s laughter will always bring you joy and laughter.