A salesman knocks on the door and a small child answers The salses man asks, "Is your father home"? "No, he was ran over by a tractor". "I'm sorry to hear that, is your mother home"? "No, she was ran over by a tractor". "Do you have any big brother or sister at home"? "No, they were ran over by a tractor" "So what are you doing here all alone"? "I'm driving a tractor"