Since that Other Cat is still here (just nine days to go, not that I'm counting), my cat door out into the back yard is locked, as he can't be trusted not to run away if he gets outside. So if I want to go out on my deck, I have to sit by the back door and look sad until mum or dad opens the door for me. This is my "please open the door because I am a very deprived cat" look and it works every time.
Of course, since I am a good girl, I never leave the back yard. Well, almost never.