There are so many Artix Entertainment Game related "Harlem Shake" videos that it became mandatory to put them all in one place for your viewing and /facepalm'ing pleasure. Enjoy!
EpicDuel Harlem Shake
From the game at www.EpicDuel.com
Artix Entertainment Harlem Shake
MechQuest Harlem Shake
From the game at MechQuest.com
HeroSmash Harlem Shake
(by Wonderpbread) From the game at www.HeroSmash.com