I've known to open the door for a long time. This is the first time I've seen strange reception by people. I am very surprised to believe that every time my father saw me I could open the doors as if I was doing something very strange. Strange human, you can open the door, but why can not I?
As you know, the unlocked doors open immediately on the arm of the door by bouncing. Every cat with an average intelligence level knows it. Of course, we would like to have a button on the bottom, but for the moment it is a request outside the limits of human intelligence. If the door is locked, the door can not be opened by bouncing on the arm.