...by coworkers who pop in to chat (or even people who need you for legit reasons). Morgenstern suggests this exit line: "I want to give you my undivided attention but can't give you that now." Then offer a time and date to meet—in the future. Also effective, says Shari McGuire, a time-management expert and the author of Take Back Your Time: standing up at your desk, which tacitly "communicates urgency to wrap things up." But don't skip lunch or breaks, says Morgenstern: "You'll end up working harder and longer but not as effectively."