Quote from Geoffrey in The Fresh Prince Project
Geoffrey: If you will follow me, I will show you to your room, Master William. Will: Hey, man, it's cool if you just call me Will. Geoffrey: Master William... tradition dictates that a clean, unbreakable line be drawn between a family and their butler. Therefore, it is necessary for the operation of a household that you address me as Geoffrey and I, in turn, address you by your proper title: Master William. Will: Who are you, Robo-butler, man?