The "Harlem Shake" meme seen in the videos isn't even the real Harlem Shake. The real Harlem Shake (dating back to 1981) is completely different and much more complicated.
LOL! You'd be surprised by how much people are taking the new Shake seriously and how much a lot of them HATE this meme. I've seen people on other forums literally grumble about it as "crappy 'dancing.'"