Most people today think nothing of opening their doors to their homes in your typical suburban neighborhood when the doorbell rings or there is a knock at the door. People assume it’s a neighbor, or a package delivery, etc, etc. While it is still prudent to make sure you know who is at the front door before you open it; post apocalypse it takes on a whole different outlook.
In a post apocalyptic world; should there come a knock on your front door, of wherever you are calling home, do not answer it. Why; similar to what happens in countries where wars are a common occurrance, once someone hears a homeowner respond to the knock from the other side of the door; they send some rapidly fired bullets through the door injuring or killing the occupant. Then they proceed to break in and take control of the home.
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