this is a good one too:
A visiting merchant once left his money outside all night, thinking that it would be safe because of Dracula's strict policies. To his surprise, some of his coins were stolen. He complained to Dracula, who promptly issued a proclamation that the money must be returned or the city would be destroyed. That night Dracula secretly had the missing money, plus one extra coin, returned to the merchant. The next morning the merchant counted the money and found it had been returned. He told Dracula about this, and mentioned the extra coin. Dracula replied that the thief had been caught and would be impaled. And if the merchant hadn't mentioned the extra coin, he would have been impaled, too.