There was a farmer who had a brown cow and a white cow and he wanted to get them bred.

There was a farmer who had a brown cow and a white cow and he
wanted to get them bred. So, he borrowed his neighbor's bull
and turned it loose in the pasture. He told his son to watch
and come in and tell him when the bull was finished.

"OK, Pop." said the little boy.

After a while, the boy came into the living room where his father
was talking with some friends. "Say, Pop", said the boy, "the bull
just fucked the brown cow".

There was a sudden lull in the conversation. The father said,
"Excuse me" and took his son outside. "Son, you mustn't use
language like that in front of company. You should say
'The bull surprised the brown cow'. Now go and watch and tell
me when the bull surprises the white cow".

The father went back inside the house. After a while the
boy came in and said, "Hey, Pop".

"Yes, Son. Did the bull surprise the white cow?"

"He sure did, Pop! He fucked the brown cow again!"