Behind closed doors...

Today, I saw this:

Isn't that wonderful? A door which must remain closed when it's not being used. Correct me if I'm wrong, but that's sort of what you'd expect from a door that no one's opening and walking through. I fail to understand why this particular door needs a sign to prevent people opening it when they have no intention of entering the room behind it. If anything, I'd say the notice would only invite more curious passers-by. Baffling.

Even more fascinating though, is the second poster - on a door which must be kept locked at all times. How intriguing. I wonder what lies on the other side of this one... something horrific no doubt if the public are advised not even to unlock it. The first thought that went through my mind was, "why don't they just brick it up?"