Interviewer: How much milk do these cows give? …. Farmer: Which one? The Black one or the Brown one?… Interviewer: Brown one…. Farmer: A couple of litres per day. … Interviewer: And the black one? … Farmer: A couple of litres per day. … Interviewer(naturally a bit flummoxed): I see. What do you give them to eat? … Farmer: Which one? Black or brown? … Interviewer: Black. Farmer: It eats grass. … Interviewer: And the other one? … Farmer: Grass. … … Interviewer(now really annoyed) : Why do you keep asking which one when the answers are the same?! … … Farmer: Because the black one’s mine…. … Interviewer: Oh, and the brown one? … … Farmer: It’s also mine.