It is a Friday and Brielle is running a late for class. The bell is about to ring, so she sprints for the door to her AP Psychology classroom. As she is running, she forgets that her shoes were untied, trips in the hallway, and slides across the floor into the classroom. Everyone in class laughs. Brielle is extremely embarrassed and is sure that no one will ever forget this horrible incident.
After stressing all weekend, Brielle makes her way to AP Psychology on Monday. To her surprise, she finds the class has no reaction when she enters and everyone seems to be more concerned with sharing the details of their weekends.
Brielle's worries about the incident are a good example of what concept?