A country doctor was making a house call at a farm. He spotted a well at the side of the house and walked over to it. He leaned over to see how deep the well was, but unfortunately he leaned too far and plunged to the bottom. It took rescuers hours to pull him to safety. When the ordeal was over the farmer remarked to the doctor, "I hope you've learned your lesson."
"What lesson is that?"
"A doctor should tend to the sick and leave the well alone."
