This rancher was trying to get a few last breedings out of his old prize bull. But the bull was not showing any interest in the cows that he was expected to service. So the rancher called the vet and the vet told him that he had some experimental pills to give the bull.

The day after giving the bull one of the pills, the rancher saw the bull servicing every cow in the pen. Then he broke out of the pen and started servicing the cows in his neighbors pasture.

So he went to the neighbor to apologize and told the neighbor about the pills. The neighbor asked, "what are those pills?".

To which the farmer answered, "don't know what they're called, but they taste really minty".