I used to look after equipment in the tallest building in our town.
To gain access to it you had to get the lift to the top floor then walk up some stairs into a very dark room with a light switch to the right in the dark.
Unfortunately the telco who also had equipment up there decided to put their main shutoff switch close to this switch.
I may of on occasion flicked the wrong switch.
I know this because when I returned I noticed the shut off switch had been moved far away from the light switch and no longer was easy to confuse in the dark for the light switch.