The governor of the Bank of England began an address to an assembly of bankers with these words:
“There are three kinds of economists: those who can count and those who can’t!”
A MIT linguistic professor was lecturing his class. “In English,” he said, “a double negative forms a positive. However, in some languages, such as Russian, a double negative remains a negative. But there isn’t a single language, not one, in which a double positive can express a negative.”
A voice from the back of the room piped up, “Yeah, right.“