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"A chicken runs into a library, goes to the main desk and says, ‘Book, bok, bok, boook.’ The librarian hands the chicken a book and it tucks it under its wing and runs out. A while later, the chicken runs back in, throws the book on the desk and says, ‘Book, bok, bok, bok, boook.’ Again the librarian gives it a book, and the chicken runs out with it. A few minutes later the chicken is back, and returns the book saying, ‘Boook, book, bok, bok, boook.’ The librarian gives the chicken a third book, but this time follows it as it runs out. The chicken runs down the street, through a park and down to the river where a frog is sitting on the bank. The chicken holds up the book to the frog, saying, ‘Book, bok, bok, boook’. The frog replies, ‘Read-it, read-it, read-it…’ "
A linguistics professor was lecturing to his English class one day. "In English," he said, "a double negative forms a positive. In some languages, though, such as Russian, a double negative is still a negative. However, there is no language wherein a double positive can form a negative."
A voice from the back of the room piped up, "Yeah, right."