Social media has greatly aided the organization of such events, and proof of their existence has been caught on camera only to go viral online via sites like YouTube.
While there are a few groups who still carry on the practice, Improv Everywhere being the notable example, a high profile flash mob event is likely to have corporate backing, as companies jump on the bandwagon as part of viral marketing campaigns.
We've rounded up the very best flash mob events from both big brands and ordinary bands of people. For your viewing pleasure, here are 15 fine examples of flash mobbery.
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