There was a patient who went to the doctor. She complains why her hair is fast white.
Patient: Doctor, why is my head hair fast white gray?

Doctor: That's because it's in the head, as the Mind Center becomes fast white

Patient: Oh Gitu dock, but why my "bottom" hair is not fast white?

Doctor: Because that area is the Entertainment Center .. HAHA

Patient: Ooo Doctor Edan!