We posit that a single exposure to rudeness in the morning can contaminate employees’ perceptions of subsequent social interactions leading them to perceive greater workplace rudeness throughout their workday. We expect that these contaminated perceptions will have important ramifications for employees’ work behaviors.

Source: PsycNET Record Display – PsycNET

Think about that student that comes to your and always seems to be in a bad mood. Could their morning have something to do with it?