…and I feel no shame at all, at all. A large portion of it was spent vaguely trying to figure out where the cat had gotten to, outside. Turns out that what he had gotten to outside was to promptly come back inside; only I somehow forgot about that. I decided that this situation indicated that I should emulate my cat and go take a nap, which was a smart call on my part.
No, I don’t expect anybody to find this interesting. It’s still funny that I forgot that I let the cat back in, though. Certainly my wife was amused.
So, either your cat can walk through walls, or it has some sort of BRAIN FOG that made you forget you let it in. Either way, you should keep an eye on it.