I love this story:

A division of AppleComputer started having developers report LinesOfCode written as a ProductivityMetric. The guru, BillAtkinson, happened to be refactoring and tuning a graphics library at the time, and ended up with a six-fold speedup and a much smaller library. When asked to fill in the form, he wrote in NegativeLinesOfCode. Management got the point and stopped using those forms soon afterwards.