Cat and Door Riddle

Here's a riddle. Cat owners will get it.

Question: Imagine two identical rooms connected by a door. Place a cat in one of the rooms and close the door. Occasionally open the door. Which room does the cat want to be in?

Answer: The other room. 

What is that? I have the A/C on in the bedroom and keep the door shut. If I let Dora into the bedroom she starts to dig at the carpet near the door to get out so she's banned. Alfred just camps out at the door and if I let him into the bedroom he camps out at the door on the other side. Only if I go into the bedroom Alfred will trot in and crash out next to me.

I've lived with cats most of my life and still wonder what goes on between those furry ears.