Thanks to the internet and especially YouTube, Flashmobs have become quite the sensation. Here are some teachers breaking it down with the YMCA.
Dancers in bunny costumes during the press preview for the new parade "Disney Easter Wonderland" at the Tokyo Disneyland at Urayasu city, suburban Tokyo on March 31, 2010. The Disney theme park will start the new attractions for the Easter, featuring the Alice in Wonderland from April 1 through June 30.(credit: YOSHIKAZU TSUNO/AFP/Getty Images)