Two Jewish men knock on Rabbi Levi's door.
"What can I do for you gentlemen?" Said the Rabbi once he opened his door.
They explain to him they have an argument and cannot resolve it. The Rabbi agrees to help them.
"What is the argument about?" he asks.
First Man: "Black is a color!"
Second Man: "NO! it is not!"
First Man: "It is a color!"
Second Man: "Rabbi, is black a color?"
"Well, sure..." Said the confused Rabbi.
First Man: "See, I told you. And so is white!"
Second Man: "White is not a color!"
First Man: "Rabbi?"
Rabbi: "Well, yes, white is a color."
First Man: "See? I told you Moishe, I sold you a Color TV!"