found this activity to be super cool. I can watch it again and again because despite the video being clear, i learn more things everytime i watch it again.
http://www.aps.org/programs/education/teachers/teachers-days/presentations/video.cfm

Watch physicists Becky Thompson-Flagg and Ted Hodapp trade quips as they show how to take apart a small DC motor and find out how it works. They get the armature of the motor spinning with just a battery, a few wires, and a permanent magnet. The experiment in this video is the same one described in the DC Motor Annotated Activity Handout. http://www.aps.org/programs/education/teachers/teachers-days/presentations/upload/090819-DC-motor-annotated-web.pdf

I love this!!