It took a team of twelve people over a week to set this up. Over 270,000 dominoes, lined up painstakingly, just so one lucky guy got to knock the first one down and set a new Guinness World Record*.
The feat was achieved by the team at Sinners, a "Domino Entertainment" group from Germany.
I know, the video goes for ten minutes, but seriously, it's worth watching. Yeah, they miss a few thousand dominoes here and there, but for the most part, the imagination (and execution) that went into this thing blows the mind.
* - The record is for most dominoes falling in a spiral