In Japan in a soap manufacturing company, they were making bathing soaps. The soap blocks were made, then wrapped in a wrapping paper automatically on an assembly conveyor belt and finally packed in cartons.
Many times it happened that the wrapping machine wrapped the paper without soap. i.e. you had an empty packet without soap. To rectify this problem the Japanese company bought a x-ray scanner from the US for $60,000/- to check on the assembly line whether the wrapper contained soap and was not empty.
A similar problem happened at Nirma soaps, Ahmedabad. Guess what they did?
They bought a Crompton fan costing around $60/- and placed it on the assembly line - the empty wrappers that were without the soap just blew away!!