A German researcher has found that people who deal with the public using fake smiles and a sunny demeanor to cover their anger suffer because of it:

A German scientist has proved that people forced to smile and take on-the-job insults suffer more and longer-lasting stress that may harm their health.

This shouldn’t be a problem for service people in Durham. “Service with a snarl” has been a Durham tradition for decades, or at least since 1981 when I first moved here. If anyone’s masking their real feelings in Durham it’s to hide their sunny dispositions.