Silent Running

(A regular comes in every day for cigarettes. I am always a polite and friendly cashier, who asks how the customers are.)

Me: “Hello, sir! How are you today?”

Customer: “How are you today? How am I today? How am I today? Every day you ask this, and you really don’t care how I am, so in future don’t ask; just give me my cigarettes!”

Me: “Oh, err… okay…”

Customer: “That’s better. You remember that now!”

Me: “I will…”

(From that day on, every day when he comes and buys his cigarettes, everything is done in total silence.)