Youtube flip - Google April mop

This was what Google do on the 1st April 2009. April Mop..
They flip the youtube site saying this is a new layout. 
Not everyone get the flipped YouTube, this is the URL that I got: http://www.youtube.com/watch?v=efRGjRMwagA&feature=rec-HM-rev-rn&flip=1
So, I guess adding a  &flip=1 will get you there.