The best spontaneous flash mob ever

The nature of most modern flash mobs is that they’re anything but spontaneous, meaning that the word “flash” is a misnomer.  Sometimes, though, real flash mobs do happen, with large groups of people coming together spontaneously for a single purpose.  When they’re ugly, they’re the L.A. Riots.  And when they’re beautiful, they’re this:

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Hat tip:  DQ