Apparently not only did the original song go viral, so did its parodies.
But when "Science Guy" Bill Nye meets Psy in this video, this parody made headlines.
I did my own version of this, just to get the pitches right.
(Copy & paste the link to the address bar to see the actual video of the parody)
http://www.youtube.com/watch?v=lHOVRhN5yTA
PS: I'm not a Gangnam Style fan, I made this mashup just for the hell of it.
"I don't own all of this, it belongs to their rightful owners."