Seen on HowFastCanYouWriteCode and deserving a page of its own ...
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.
http://www.folklore.org/StoryView.py?project=Macintosh&story=Negative_2000_Lines_Of_Code.txt
Related to viewing SoftwareAsLiability BuildingTheWorldsHeaviestAirplane