Seems as if the crowd got her to come back out and she rewarded them with Fight For Your Right.
Between the 2009 TiK ToK choreo, the return of the heart routine from last tour's Cannibal performance, and the whole Santa Claus appearance before a Beastie Boys encore, I feel it's safe to assume that Ke$ha's new humanitarian mission is to spread the word on...
RECYCLING.