There's something about Lady Gaga's Poker Face song that's got both Cartman and Christopher Walken performing it. Hilarious. Warning: it's sure to get stuck in your head.

This video covers 3 different parts of the South Park episode where Cartman's singing the song:





Chistopher Walken reading the lyrics:





The original Lady Gaga version:





And finally, there's even an acoustic version that she did on some Japanese show that sounds completely different, but proves she can actually sing and play the piano.