A farmer is entertaining guests when his son bursts into the room and shouts "Dad, the bull is **** a cow!
The farmer, ashamed at his son's colourful outburst talks to him later. "Next time you tell me this, say the bull is surprising the cow."
Well, several days later, the boy comes shouting to his dad once more. "The bull is surprising the cows"
The farmer replies "The bull cannot surprise more than one cow at once."
"Oh yes he can!" replies the boy
"Hows that?" repies the baffled farmer
"He's **** the goat!"