Engineering students come up with some pretty wacky projects while they're learning their trade. Case in point, the Cat Car- a laser guided harness system that lets you control your cat via radio control device.
Here's more on this kooky device:
Cat Car uses a steering wheel controller with an attached Arduino and gyroscope / accelerometer, which communicate with a cat harness via an XBee. The movements control a servo on the back of the cat, which moves around a laser pointer, propelling the cat forward, thus allowing the user to remotely control the cat.
Sounds like a great idea, until your cat gets wise to the whole thing and chooses to ignor the laser. Hit the link if you want to see the Cat Car in action via a real life cat!