What is Harlem Shake??

Maybe lately you often listen about Harlem Shake. What is Harlem Shake?
Harlem shake is an internet in the form of video in wich a group people perform a comedy sketch accompanied by a short excerpt from the song "Harlem Shake". As a meme the video was replicated by many people, using the same concept, and the rapidly led to it becoming viral in early February 2013.  The viewer of Harlem Shake's video in You Tube can achive thousans viewers.