A journalist visits a farmer for an interview.

Journalist: "How much milk do these cows give?"
Farmer: "Which cows? The black or the brown ones?"
J: "Let's start with the black."
F: "7 liters a day."
J: "And the brown ones?"
F: "Also 7 liters a day."
J: "And what do you give them to eat?"
F: "Which ones? The black or the brown?"
J: "The black?"
F: "They eat grass."
J: "And the brown?"
F: "Also grass."

The journalist gets a little annoyed now.
J: "Why do you keep asking me which ones I want to know about if the answer is the same for all?"
F: "Because the black cows are mine."
J: "And the brown ones?"
F: "They are mine too."