@nimh,
Only in Japan!
When I was a kid, I loved Japanese gadgets. I had an electric eraser in Japan. It wasn't too useful for erasing (it'd eat through the paper in seconds) but it was very useful for making knots in my friends' hair (they wanted them, they all thought my knotted hair was wicked cool). So useful, in fact, that the mother of one boy had to cut her kid's hair and I earned a spanking and the loss of my toy.
I still want it back.