Perpetual motion machines (hypothetical ) (http://www.youtube.com/watch?v=287qd4uI7-E#)
Perpetual Motion Machine. Magnetism & Gravity. (http://www.youtube.com/watch?v=RkLfpXpO5sQ#)
Free Energy Generator 2 (http://www.youtube.com/watch?v=skAePZGgpAA#)