Sir Arthur Conan Doyle, the creator of Sherlock Holmes, was waiting for a taxi outside the railway station in Paris. When the taxi pulled up, he put his suitcase into it, and then got into the taxi himself. As he was about to tell the taxi-driver where he wanted to go, the driver asked him: "Where can I take you, Mr. Doyle?"

Doyle was astounded. He asked the driver if he knew him by sight. The driver said: "No Sir, I have never seen you before." Doyle…