Lady to farmer: "Good evening Sir, we are here to collect
information on the cause of Mad Cow Disease. Do you have any ideas on the subject?"

The Farmer stared at the reporter and said, "Do you know that the bull screws the cow only once a year?"

The Lady (getting embarrassed): "Well sir, that's a new piece of information to me. What's that got to do with anything?"

Farmer: "Well, Madam, do you know that we milk the cow four times a day?"

The lady, even more confused says, "No, I didn't know that."

Farmer: "So, just imagine I was playing with your tits four
times a day but only screwing you once a year, wouldn't you get mad, too?"