Millions of Dominoes Fall

From Rueters, it's a video of the world domino record being broken. Actually, it's more of a highlight reel. The dominoes numbered over four million and the video is only two and a half minutes long. Still, it is pretty impressive. If you're going to break a world record, you might as well pick one that takes infinite patience to prepare and on which assembly could be halted at any moment by an errant sneeze.