The thing I think I like the best about this video is the sound. Just all those dominoes falling at once is so loud. I like the Coub version of the video cause it just gets to the best part, and then loops it forward and backward forever.
However, the source video is not bad, cause it shows how the whole thing was built:
And then includes the fun part, and then the clean up, and the inevitable fails that happened in the process.