My secretary began to post unusual news articles,cartoons and pictures of faraway lands on our office bulletin board. Although she changed the items on a regular basis，no one mentioned her efforts.Eventually she put up a notice stating that she would give one dollar to the first person who read the announcement and informed her about it. Two weeks later, she received her first acknowledgement，a handwritten reply left on her desk:"I just wanted you to know how much I enjoy your interesting bulletin board. The Cleaning Lady.”