You’re late for work, and it’s pouring rain. In the parking lot, a car speeds around you and takes the last spot near the building entrance. You end up trudging from the back of the lot and get soaked to the skin. You’re mad, and you know your judgment at the moment is probably impaired. Worse, the leftover anger will continue to color your decisions at work, our research suggests, without your awareness—not a good thing for anyone trying to steer the best course through the day’s business problems.

A version of this article appeared in the September 2010 issue of Harvard Business Review.