Gang of Rhythm, by Walking off the Earth: http://www.youtube.com/watch?v=oHvl6z56 ... 6g&index=1
I first saw this one on my 3DS and I enjoy the vidoe and the song.
Edit:
http://www.youtube.com/watch?v=iCkYw3cRwLo
Don't know if that's been linked to or not, but it's a video mixing a lot of the viral Youtube Videos together. I found it interesting. The two songs in it are Gangan Style and Call me Maybe.