[JacobAldridge]

Tangential anecdote - someone in my office went label mad mid last year. I made the observation that anybody who needed a label to know that the only light switch in the meeting room was, indeed, the light switch for the meeting room, was too dumb to benefit from meeting with us anyway.

[derefr]

My kitchen has a switch on a little stub of a wall, the other side of which is part of the living room. The living-room-side switch controls the kitchen lights, and vice-versa. It makes sense when you realize that you can use them to do a sort of "airlock" process, turning on the light in the room ahead of you, entering it, then turning around and switching off the lights in the room behind you.