My son and I have seen balancing robots on the internet and decided to try and duplicate the feat for his science fair. After 100's of hours of failure and giving up on the idea that it would ever work my son built a new robot. Then in classic science fiction style I changed a + to a - in the program and voila, it worked!
So we made a video of the project and put it to the sound track from Vitas' Opera #2. After getting permission from Vitas we posted it on YouTube.