Electric fan

A Japanese soap manufacturing company received a complaint that a consumer had bought a box of soap that was empty.

Management asked its engineers to solve the problem permanently to avoid it happening again.

The engineers worked hard to devise an X-ray machine with high-resolution monitors operated by two people to watch all the soapboxes that passed through the line to make sure they were not empty. They worked hard and they worked fast.

However one of the company’s employees came up with another solution. He bought a strong industrial electric fan 
and pointed it at the assembly line. He switched the fan on, and as each soapbox passed the fan, it simply blew the empty boxes out of the line.