>The farmer exclaims, “Ah, Rebbe, you are so smart!! No wonder people from all over come to you for an advice. How did you know that the cow is from Pinsk?”
>The Rabbi says, “Ah, that was easy; my wife is from Pinsk.”

I'm not sure I follow....did the Rabbi's wife also buy a cow from Pinsk?

I read that joke twice to see if I missed something, so not sure I get it.