Thanks to JohnnyL for sharing  this joke with us.

The farmer goes to town one day, and runs across his old buddy who is a tractor sales man. How is it going? Asks the farmer. "Not very good, I haven't sold a tractor in two weeks" said the salesman, "How is it going with you?" "Not so good" replied the farmer. "The other night I went out to milk my cow. First she tried to kick me with her right leg so I tied her leg to the right side of the stall. Then she tried to kick me with her left leg, so I tied that to the left side of the stall. Then she swatted me with her tail so I tied that to the ceiling. Then my wife walked in and if you can convince her I was just trying to milk that cow, I'll buy a tractor from you!'