In Rochester New York, a new skyscraper was built for Xerox Corporation. Upon completion, it was time to fill the fourth floor executive swimming pool. But a janitor held up progress. He had a feeling that the weight of the water was too much for the building to support. The architects checked, and sure enough, they hadn’t accounted for the water. If he had opened the valve to fill the pool as instructed, the building would have come crashing down. The fourth floor now has an executive ice skating rink.