From Gotye, on the YouTubes:

Reluctant as I am to add to the mountain of interpretations of Somebody That I Used To Know seemingly taking over their own area of the internet, I couldn't resist the massive remixability that such a large, varied yet connected bundle of source material offered... All audio and video in Somebodies is from the YouTube user videos featured, each of them a cover or parody of Somebody That I Used To Know. No extra sounds were added to the mix, but I used some EQ, filtering, pitch-shifting and time-stretching to make the music.

This calls for a poll!