Ayan, cmiller and I decided to each write a pong game one day. Ayan wrote his in xlib. Chad wrote his in python. I wrote mine in Java.

It's incomplete, but you can see the ball bouncing and move the paddle around and make it bounce. If you want to play with it, I've put it up:

grumpong-0.01.tar.gz

It was a fun afternoon exercise. I may eventually finish it.