Dh and I were sitting together in the living room, he's watching a Bond film and I'm half-watching it while MNing, and we're commenting on it to each other from time to time. Then a thread on tinned fruit made me think "Oh, do we have any, or do I need to put it on the shopping list for tomorrow?", so I went into the kitchen to check. Which led to another thing, then another, until 15-20 minutes later I find myself upstairs.
I just walked out of the living room without saying anything and didn't come back. Is that rude? I can't decide. It's not like we're in charge of each other, but normally we'd say something. Expert perhaps for a loo trip during an ad break.
Do you tell each other where you're going when you leave the room?