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.

"Yeah daddy, yeah daddy" said the little boy.

After a while the boy came into the living where his father was
talking with some friends. "Say, Pop", said the boy. "Yes",
replied his father.

"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, Daddy".

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

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