I love videos of flash mobs dancing something everyone (or most everyone) has heard and at least tapped his/her toes to. But this? Absolutely amazing.

To celebrate what would have been Michael Jackson’s 51st birthday, some 50,000 people (give or take a few hundred or so) gathered near Mexico’s City historical center on August 29th, 2009 for a flash dance to the choreography of the original Thriller video.

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Bonus points: the actual dancing crowd broke the Guinness Record–by a mere 13,300 or so.