"What Does the Fox Say?" seems too stupid to be real - like some kind of faux-serious children's song gone too far - and that's exactly the point: Vegard and Bård Ylvisåker, the brothers behind the song, purposefully made it for a show of theirs to be stupid and terrible, which they would then apologize for. When it became one of THE most popular Youtube videos of all time (currently with more than 500 million views), it was as much a surprise to them as it was the rest of us.