Blue udders

When a farmer neglects to milk his dairy cows, and the buildup of milk causes pain and distress for the poor cow

Farmer Dave: Hey boy, did you milk the dairy cows yet?

Boy: The dairy cows? Why, I was busy tending to the chickens!

Farmer Dave: You fool! Haven't you any clue what you've done!? You gave my dairy cows, my pride and joy in this world blue udders!!!