Eventually the topic got around to politicians and their role as our leaders.
The old farmer said, " Well, as I see it, most politicians are 'Post Tortoises'.''
Not being familiar with the term, the doctor asked him what a 'post tortoise' was.
The old farmer said, " When you're driving down a country road and you come across a fence post with a tortoise balanced on top, that's a post tortoise."
The old farmer saw the puzzled look on the doctor's face so he continued to explain.
Spoiler: