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I don’t remember the specifics of this tale, but I do remember the relevant parts.
There was a factory that had a problem with a production line. Apparently a filler nozzle would occasionally fail to engage one of the plastic containers as it came down the line resulting in an empty bottle being shrink wrapped in a finish package. The company brought in an expert who studied the problem and decided that though there was no way to prevent the occasional bottle from failing to be filled, he could set up a detection system so that no empty bottles would be placed in the final package. He replaced the conveyor with an more expensive one that included a scale to weigh each bottle after it was filled. Then a custom software package would shut down the production line so that a worker could remove the empty bottle. The worker would then hit a button to restart the line. He also included a counter to keep track of how many times the line was shut down because of an empty bottle. The consultant’s fees and hardware upgrades ran close to a million dollars.
After a month the manager noticed that his report on miss fills was always 0. He went to check on the counter to see if he could find out what was wrong. He discovered that one of the line workers had gotten tired of having to constantly restart the line after the system detected an empty bottle. So he had set a $15.00 fan up right behind the filler nozzle to blow any empty bottles off the conveyor before it reached the scale.

Whether you think you can, or you think you can't--you're right. - Henry Ford

Nothing is impossible--to the guy who doesn't actually have to do it. - Probably one of Henry Fords employees.