It's not the most-watched video on YouTube; nor is it the best-attended flash mob in history. But this event that took place in Mexico City on August 29, 2009 -- just weeks after pop icon Michael Jackson's death, on what would have been his 51st birthday -- holds a record of a different kind. It's in the Guinness Book of World Records for being the largest "Thriller" dance ever [source: Guiness].
The Instituto de la Juventud del Gobierno del Distrito Federal organized this flash mob at the Monumento a la Revolucion in Mexico City, and 13,597 people participated [source: Guiness]. The only directive appears to have been to perform the "zombie dance" from "Thriller" music video, and many participants went dressed as zombies, though some were dressed as the pop singer himself. Because the event happened before the shock of Jackson's death had fully subsided, videos of the event made it to mainstream newscasts worldwide.