Animation of two seals flipping a ball back and forth. A lot of fun for a gifted group - if you'd like to compose your own then documentation is included in the ZIP files on how to produce animations on the calculator, and on the PC using the ADK (38G only).
A cool graphics demo featuring realtime animated 3D graphics. It has a fast line routine, Sin/Cos lookup code, uses 1.7 fixed point math to do the calculations, and double buffering for the animation.