I know an ever worse one than the one I posted yesterday. But instead:

In Russia, in the evil days of the Tsar, two brothers, Yosl & Moish, ran a tavern together. One evening, after closing time, they took their sleigh into town to buy a barrel of vodka. They took turns cautioning each other that this was strictly business & they must not dip into the stock. On the way home, however, the weather turned miserable, and Yosl discovered that he had a kopeck in his pocket, and had an idea. "Moish," he said, "Here is a kopeck. Sell me a shot out of *your* half of the barrel." "Well," says Moish, "Business is business. I can't turn down a paying customer." So now Yosl has a shot of vodka, and Moish has a kopeck. Obviously -- well, you get the idea. By the time the horses have found their way home, the brothers are in perfect agreement that business has never been better.