Brian and I have the most passive-aggressive "argument" going on lately about the sliding door out to the backyard. I don't mind that the glass door stay open to allow the fresh air in, in fact, I enjoy it. But I can not, simply can not, allow it to stay open after I go to bed. I have issues with that. Even though I can lock the screen, I don't trust an open door all night. The "argument" comes from my closing and locking the door as I'm heading upstairs, before Brian himself is asleep. Because as soon as I'm upstairs and settled in front of my television, I hear the door open again.
Now I know that I'll have to wait for Brian to fall asleep, and then sneak downstairs to close the door all quiet-like. Which isn't difficult, because he'll be asleep in less than an hour, but still. Actually, it's not even annoying. I just enjoy that it's a weird little issue that we don't talk about, but casually inflict on each other.