Poker Face by Lady Gaga, Christopher Walken, and Cartman

If there ever was an artist open to parody, it's Lady Gaga.

Here's a mashup:
http://www.youtube.com/watch?v=6tZG5j1nGsA

Cartman:
http://www.youtube.com/watch?v=SSEST-oQH68&feature=related

Christopher Walken:
http://www.youtube.com/watch?v=A2guQYivZ6w