That is so clever. How do you do it?
At a guess -
Camera on tripod, remote control, 2 sec shutter delay.
Then pile the images all together in iMovie.
The multi image one similarly but photoshop instead.
..d
All in Photoshop actually, just created an animated gif for the moving one. How the hell you even know the shutter delay I can't fathom!
Multiple exposures are fun.
And yes, with too much time on my hands a friend and I are already planning a stop-motion fist fight (which has been done before, though I can't be bothered finding it right now. I may have time on my hands, but that doesn't stop me being lazy...)
(That's the boring answer, the real way of doing it was revealed by Clarion...)