Courtesy of hack-a-day, check out the following video illustrating an analog computer that implements the dynamics of a bouncing ball, not using a microprocessor, but just a circuit involving analog operational amplifiers.
Bouncing ball analog computer – Hack a Day.
httpv://www.youtube.com/watch?v=qt6RVrmvh-o
Many, many a science project was started with an open bottle. This is one further argument against GWUI (geeking while under the influence). 🙂
Cheers!