MOTHER IN LAW - BEAUTIFUL ANIMAL GAG

A small farm boy was milking his cow when all of a sudden a bull came charging towards him.
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As horrified workers nearby watched, the boy calmly continued his milking.
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To everyone's astonishment, the bull stopped a few inches from the boy, turned around and walked away.
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"Weren't you afraid?" One of the workers asked the boy.
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"Not at all," the boy replied , "I knew this cow was his mother-in-law."