the very original purpose of doors is to protect personal properties
actually, under most circumstances, you are not secured until you are behind the door
at least I feel it that way
you are all alone, and the size of the room is the size of the world
you can do whatever you want to do when behind the door, or some doors

door is a damn good thing
it shelters you from disturbance and dangers outside
and also shelters the fear and darkness from inside of you
it will be royal to you except extreme situations
the rotation of the hinge produces beautiful sound
which reminds you of the swinging of a pendulum
just like the whisper of an old man

when you get angry and can not find a way out
you can just punch on a door, and no strike back
it just make a loud noise, as if it is responding you
and according to physical principles, your fist would hurt like hell
but this at least raises your awareness of being alive
and the pain of your body would relieve that of your mind to some extend

when my computer gives me a blue screen, I punch the door
when my codes don't work, I punch the door
when the network is too jammed to login my msn account, I punch the door
as a matter of fact, as long as life contradicts with your expectation,
which is usually the case, you have good reasons to punch the door
by this I mean if you don't punch the door, you would punch someone sooner or later
than, let the door be the victim

sorry, dude, I don't mean to hurt you, I just want to keep myself conscious