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Bricks that lay themselves.  Recorded December 19, 2016 in Teralba, near Sydney, Australia, where this technique is used to build a retaining wall.   Explanation: The blocks just catch the edge of the next block until they reach the end, where the last one is able to fall completely flat, which is just enough to allow the one behind to also fall flat.  Each block must be an exact distance from the next in order for it to work.

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