chocolate cow?

Brandan is soooo into chocolate milk these days. I try to get him the non fat, low sugar ones, he can't tell the difference and still loves it.  We finished one carton and he wanted another one when we were in Trader Joe's.  When i explained to him that he could only have chocolate milk or jelly beans. He picked choco milk. Later on he told me, mommy, chocolate cows drink chocolate milk and then he gives us more chocolate milk.  So i told him, baby, cows eat grass and give us milk.  Pauses for a few second, he told me the cows eat chocolate grass, so we have chocolate milk. And the cows love it and the ate lots and lots of chocolate grass everyday like bunny rabbits.