Do you have a coworker whose company you sometimes enjoy, but who also has a tendency to drive you crazy? Laypeople might call you frenemies, but psychologists would say you have an "ambivalent relationship." When you have extreme feelings on both ends of the spectrum for someone, it can be quite stressful, but it can also prompt you to think in unfamiliar ways. Our obsessions with our frenemies may make us more open-minded and empathetic as we try to analyze their behavior. This was the conclusion reached by researchers University of North Carolina at Chapel Hill, who studied pairs of subjects and found that those with more ambivalent relationships performed better on an editing task, and also felt more understanding of their partner.