I had been in so many fire drills.. in school, at work, in apartment buildings.
My recent experience was in my local library. Because we all knew it was just a fire drill, people were very calm. I, myself, collected all my belongings and was one of the last ones to get out. However, if it was a real fire, I would still collect my belongings but at super speed and get the heck out of there in hurry.
Why? Fear. During fire drills, there is no fear. Real fire, there is fear... fear of getting burn, fear of smoke inhalation, even fear of dying.