Actually the old fashioned Rotary action self-winding watch used a similar principle. No electricity of course but self winding none the less. If I remember the principle correctly it had an off set weight that swung round inside the watch case as you moved your arm and that was sufficient to keep the watch spring wound.
Presumably a w@nk would cause you to arrive early for appointments! 

Not sure about that. In fact, I could not possibly comment.
I have an "automatic" watch , it is a good, expensive Seiko, purchased in Gibraltar, as one of a pair. About a year after I had it, it began to run slow, so I took it to a watch repair shop (in France) to have new batteries. Went back half an hour later to a lot of sniggering and Gallic shrugs, and the immortal works, "zees watch does not take zee piles (batteries) you must... how do I say?.... move faster." Bloody cheek.

Having said that, I just had a nasty shock, I set it by the atomic clock in the lounge this morning and have been out walking for most of the day. When I just checked it I thought I must be dead, it said 16h40 when the atomic clock showed 17h50. The second hand is just crawling around. Bah!