A female TV reporter went to have an interview with a farmer seeking the main cause of Mad Cow disease  
The Lady : Good evening Sir, we are here to collect information about the reason that causes Mad Cow Disease. Do you have any idea what might be the reason?  
The Farmer stared at the reporter and said, Do you know that the bull fucks the cow once a year?  
The Lady (getting embarrassed): "Well sir, that's a new piece of information, but what's the relation between this phenomenon and Mad Cow Disease?  
The Farmer : Well Madam, do you know that we milk the cow four times a day ?  
The Lady : Sir, this is really valuable information, but what about getting to the point?  
The Farmer : I am getting to the point Madam. Just imagine, if I was playing with your tits four times a day and only fucking you once a year, wouldn't you get mad?