When Jack Black and his bizarre friends parody "Happy"!
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Even if the lyrics of this parody just don't make sense, the soundtrack is still just as catchy. Weird Al 'Yankovic is well known for his parodies on Youtube. This video is filled with little gems like when Jack Black twerks at 2:21 or when the world's most sketchy guy shows up at 1:17. Have fun!
http://youtu.be/XsWo8apgLys
