Some years ago I worked for a semiconductor company. Their new microprocessor chip had about a 15% yield - i.e. 85% of the chips were faulty. This is far from unusual when a new process technology is introduced. They encapsulated these faulty chips in clear acrylic plastic as key fobs and sold them in their in-company store. The joke in the factory was they made more money selling the key fobs than the microprocessors...

Tim