[PC][2005-2012] help remembering a pc game

Platform(s): PC

Genre: story/puzzle/strategy

Estimated year of release: 2008

Graphics/art style: 3D

The only thing I remember is when you beat the game there was a dance floor and your characters that you played with would dance this funny dance with a knight in a full armor set. I remember beating the game for the sole purpose of this endgame scene. I am 90% sure it was a scooby doo game.