[Your butler has always been suspicious. You've never seen him eat, drink, or sleep. He is your teacher in math, chemistry, biology, geography, and literature. You always get an eerie feeling when he's not around, as if he's still watching you despite him not being there...]

You're in your room as he's teaching you about the human organs when you start thinking about wanting a coffee. You zone out and 5 minutes later, he hands you a coffee. Specifically the one you wanted... How did he know?