Fire Alarm

Imagine you are at work and the fire alarm goes off. What would you do? That happened at work today for me and a strange thing happened; nobody did anything. Everybody just sat their desk, looked around, looked annoyed by the piercing sound and continued to work. There was no mad rush for the doors. Nobody even got up from their chair. Do we not believe the fire alarm? Do we have to smell smoke or see flames before we leave? By that time isn't it too late? It turned out the alarm was set off by somebody burning their popcorn in the microwave. No need to panic.