I've got an assignment from a class I TA for:
Bring in unusual simple games as examples for programming.

I can bring in the following hardware:
Laptop w/MAME and joypad, 26/5200,Inty 1,CV,Vec,C64
Some Ideas so far:
Illusions CV, any Vec game (for the visuals) Robotron, Inty Maze-A-Tron,
Tron Solar Sailer, I Robot, Zookeeper

The more cracked-out the better. Simplicity is desired.