MT. VERNON, ILPatty Walther, a passive, mousy administrative assistant at Datalock Inc., was put in her place Tuesday by sales representative Martin Challey. 'Oh, thank you for coming all the way over to my desk to return that valuable pen,' Challey said sarcastically. 'I don't know how I could've gotten any work done without it. I might've had to use one of the other 20 pens right in front of me.' Challey last berated Walther Monday, when the quiet coworker brought in a plate of homemade brownies. 