Thanks! Share it with your friends!
If you doubt it's from the South Park team have a look at the credits lists at it end of the original videos on this page:
http://www.coldhardflash.com/2007/07/flash-animated-philosophy-from-south.html (It also contains a small article with a brief explanation as to why they made it.)
I edited them out to make it shorter but I realize I shouldn't have.