Patrick Agostinelli illustrates why firefighters must guard against complacency when responding to a call that appears to be similar in type to one they are called to hundreds of times a year. Even though the building in his article was vacant, it was filled with hazards that included wires in the hallway, explosives, and half-filled gasoline containers.

Firefighters, officers, and chiefs are accustomed to certain ways of responding. If a person calls the fire department for an odor of smoke coming from the kitchen during dinner time, the responding units will make assumptions based on the type of call and the time of day it occurs. 
Fire EMS

In the fire service, we tend to focus on our mistakes and the things that went wrong. These can be important learning lessons, but we seldom point out the things that we did well.