Failing Manhood

Concerned about his failing manhood, a farmer went to the local doctor for help. The doctor gave him a small container of pills and told him to take no more than one a day.
Back home, the farmer thought he'd try the medication on his stud horse first. The horse swallowed the pill, jumped out of his stall, kicked a side of the barn over, and ran off down the road.
"Those pills are too strong for me," the farmer thought, and pour the rest into his well.
Later, when the doctor came to check on him, the farmer told how he had disposed of the medication.
"Heavens!" exclaimed the doctor. "You haven't drunk any of the well water, have you?"
"No," said the farmer. "We can't get the pump handle down."