The structure is always the same like taking some memorable moments of the video eg at the start the plane or the guy shaking his pelvis in the lift , then take some other stereotype or celebrities in it. So I actually wonder how many more views came from the parodies.
Last similar wave I remember was the "shit says " series maybe 6 months ago that had a similar formula.
here some examples:
Mitt Romney style
http://www.youtube.com/watch?v=zTs_TKk5S2M http://www.collegehumor.com/video/6830834/mitt-romney-style-...
Eastern Europe Style http://www.youtube.com/watch?v=zY1MVQeeStY&list=UUFjCy-D...
Eton Style http://www.youtube.com/watch?v=qaJl_qOVcf0