Would your coworkers describe you as negative? If so, tell them this...

Negative people get more done at work. 

Go ahead and tell that to your happy-go-lucky coworkers. Research from the University of Pennsylvania found that grumpy, angry or hateful people have less to do with their time and tend to be much more focused on the task at hand than their cheerful counterparts. The haters are also more likely to become more skilled in certain work areas and experts in their field.

The study also found that starting off your day on the wrong foot could be the right approach. People who felt distressed, hostile, or guilty at the beginning but better by the end of the day were more productive than the people who felt positive from morning to night.