I got taken to a site at anna's suggestion in another string, which for anyone who didn't LIU, also contained the following joke more relevant to this topic:

A businessman arriving in Boston for a convention found that his first evening was free, and he decided to go find a good seafood restaurant that served Scrod, a Massachussetts specialty. Getting into a taxi, he asked the cab driver, "Do you know where I can get Scrod around here?" "Sure," said the cabdriver. "I know a few places... but I can tell you it's not often I hear someone use the third-person pluperfect indicative anymore!"