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 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.