Time for a pic:

Ever seen a surprised TV inspector? Have a look at the image below

Let’s re-address the drill;

1. A knock on the door (or the sound of a doorbell)
2. Open the door and have the person identify himself (could be a human with a proper job you see)
3. No, it’s a TV Inspector: close the door
5. Oops … Take a picture first and then close the door