The class clown may get in trouble, but the office wag may be the glue that makes a workplace stick together.

Research indicates that humor at work is a good thing. It builds morale and relationships. But it also hurts if it veers from being a bonding agent to an alienator.

Chris Robert, associate professor of management at the University of Missouri, focuses part of his academic career on showing the link between "non-aggressive" humor and job satisfaction. "The minefields are race, sex, ethnicity, religion, politics," Robert said in an interview. "It's important to know your audience. If you're new in a workplace, sit back and watch for context."

Surprisingly, teasing is an effective brand of workplace humor, he said. Given that it's done among adults and it isn't always at the expense of the same person or type, teasing can show cohesiveness among co-workers, Robert said.

"Most groups have unconsciously negotiated topics that are OK to tease people about. Groups tend to develop strong norms about what is or isn't accept- able." Generally, peer-to-peer teasing is easier to navigate. Managers need to be more careful to not pick on one subordinate or any one kind of person.

"One interesting thing about our research is that people who use a lot of humor are the same ones who are teased most in a group," Robert said. "There's often a balance between dishing it out and taking it." When that balance is missing, humor loses its positive effect.

"If you're being teased, that can be a sign people are comfortable with you, that you're part of the group," he said. "Insiders have a certain license to tease each other. Self-deprecation is always OK."

Be careful. Words can wound, even in jest.