DURANGO, CO—Awareness of Donald Shrifkin's upcoming birthday was raised among his co-workers Monday, when the soon-to-be 38-year-old casually mentioned the special day during a departmental meeting. "Yeah, so, I'm gonna be out of the office on Friday, because it's my birthday, and I'm taking the day off to make a three-day weekend out of it," Shrifkin told a group of fellow sales representatives. None of Shrifkin's co-workers said they intend to mark the occasion in any manner whatsoever.