There are a lot of 'greatest-ever' Vines out there. But for sheer how-the-hell-did-they-do-that-and-why genius, this one might just take the title.
Created by user 'JehReh' -- using nothing except exceptional timing, patience and probably a very willing assistant in his son -- the movie has to be seen about 10 times to really get what's going on.
Which is lucky, since it's only 6 seconds long.