This is one of the most remarkable videos I've ever seen. If you've not seen it, take a look. You'll figure it out soon enough: It's a goofy lipdub. Yawn. But keep looking and remember: this is one shot (at least until the end). One amazing tracking shot.
Difficulty seeing the video? Point your browser here: http://www.youtube.com/watch?v=Yn5L3gsCHgQ