House rule number 1: If you open it, close it.
This one isn’t really an issue because I wouldn’t return anything to a cabinet or closet open unless it’s supposed to be. I am overzealous about the refrigerator and freezer doors, though. Just the other day, my husband had to banish me from the kitchen; he was only trying to stock the fridge with the groceries he just brought home, and I kept closing the door.
House rule number 2: If you turn it on, turn it off.
I’ll take this a step further and say unplug it too — at least when it comes to the coffee maker and my curling iron. Even though both have an auto-off function, I don’t like leaving hot things on for longer than they need to be. I also unplug the toaster oven.
House rule number 3: If you unlock it, lock it.
No question here; if there’s a lock on it, I’m using it. I am militant in keeping the front and back doors of my home locked, and I also secure the car by pressing the button up to four times to ensure it’s locked and the alarm is engaged.
Real Life of an MSW 