Departing - extinguish the light!

Administration of our company hung across the enterprise ad with the following contents: "Dear employees, after working hours are kindly requested to extinguish the light, turn off your computer, close the windows and doors." These ads were hanging on every floor in several ways. On the front door someone finished: "And how would you determine that you stayed in last place?". At first everyone laughed, a few days later the administration dovesila also a second announcement, rather a guide to property. Now on each office door Veseli two sheets of paper with the following text: "Dear members, after hours, please kindly extinguish the light, turn off your computer, close the windows and doors." Explanation: "How can I tell you last?" In the room no one else there with you all said goodbye, the neighbors did not respond.