Maybe it's just the soundtrack, but this video from ThinkGeek makes the good old gyroscope toy look pretty entertaining. I've read about them in basic physics books and I have to admit...it still looks like magic to me!Here a bit from their write up of the toy:
The toy gyroscope hit the market in 1917 and hasn't changed much since your grandparents (or great-grandparents!) played with one. This classic toy fascinates us with its gravity defying stunts, which are easy to learn with a bit of practice. Wind the string, pull it quickly, and the Original Gyroscope will start spinning. Want it to walk a tightrope? Balance on your hand or head? Tilt at impossible angles without falling? You can do it with the power of physics.
Here is the ThinkGeek listing for the Original Gyroscope Toy.