Ross and Rachel's baby is in the apartment, and the couple is locked out. Rachel thinks of the different scenarios that could potentially put the baby in harm, and after she thinks of each scenario, she panics. Ross makes up an unbelievable story to indicate that Rachel is overreacting.
Dwight is confident that experience is the best teacher. He simulates a real fire for his co-workers to find out if they understand what to do in the event of a fire. During the simulation, he tries to give them advice, but they are too panicked to pay attention to him.
Scientists are trying to understand how the brain forms and processes emotions. They are conducting research on the brain patterns of positive and negative emotions to understand the brain a little bit better.