Moooo-sic To The Ears

There are these two country farmers milking their cows.

While the one farmer is milking, a fly zooms into the cows ear. The
cow starts jumping around, shaking its head and mooing. He tries to
steady the cow and suddenly it settles down. He looks down and sees the
fly swimming in the milk pail.

He turns to his friend and asks "Golly, how'd that fly get down there so
fast?"

His friend replies...

"IN ONE EAR AND OUT THE UDDER!"