Ah...actually, I think you explained that before, I just ...forgot, or didn't get it or something. He got out just before you left, and you realized he was out when you got back, or something like that.
My cat acts like she wants to be let out of the room, but as soon as I go to open the door, she runs the other way. I her, such a good kitty. She has taken to falling asleep purring, and the other morning woke me up by licking my scalp (actually, I think she was cleaning her tongue on my bristles, but prefer not to think of it that way).