I think I've unintentionally discovered a perpetual motion "machine". I was working on my lawn mower and set a screwdriver and rag down on top of my outside A/C unit. A little while later, I noticed that the screwdriver was continually turning all by itself. I thought "Hmmm, that's neat" and forgot about it. Well, a few hours later and it is still turning! I figure I'll attach a small generator and get some free power. : )
Video
Seriously, I'm sure the vibration from the A/C unit has
something to do with it, but thought it was kinda neat that it just happened to be postioned perfectly to do this. A little silly, yeah...