Helped out with a small art project at home. Josie wanted to make one of those art robots where you strap a bunch of markers to a cup and throw in a motor to have it jiggle around a piece of paper. The problem we had was that we didn't really have a good enough motor. The ones we had for the toothbrush robots were tiny mobile/pager motors.
I found a battery-acid filled Finding Nemo swimming toy in the garage and took it apart. I disconnected the motor from it and connected it to a 9V battery holder I had in an Arduino kit. The rest is artistic history.