One day while taking dictation, he noticed the manager's fly was open.  When he was leaving the room, he courteously said, "Oh, by the way sir, did you know that your barrack's door is open?"

The manager did not understand the secretary's remark, but later on he happened to look down and saw that his zipper was open.  He decided to have some fun with his new employee.  Calling him in, he asked, "By the way Mr. Jones, when you saw my barracks door open, did you also see a soldier standing at attention?"

The secretary, who was also quite witty, replied, "Why no, sir.  All I saw was a little, disabled veteran sitting on two duffel bags."