Carlton: By the way, Will, Oz called the Wizard says your brain is ready.
Carlton is referring to the 1939 film, The Wizard of Oz. It involves a girl named Dorothy is whisked away from her home in Kansas and ends up in a magical land called Oz. She must go to a place there called Emerald City to find her way back home and along the way she meets many unique characteristics. One of those includes a Scarecrow, who joins her on the way to Emerald City to find himself a brain.