A young engineer was leaving the office at 6 pm when he found the CEO standing in front of the paper shredder with a piece of paper in his hand. "Listen," said the CEO, "this is important, my secretary has left for the day. Can you make this thing work?" "Certainly," said the young engineer. He turned the machine on, inserted the paper, and pressed the start button. "Excellent, excellent!" said the CEO as his paper disappered inside the machine. "I just need one copy."