Re; Is this /.?
I take it you've never made a mistake in your life then?
'My' story is of an Electrician (I was a Computer Operator at the time, when computers were real computers and not these dinky little beige boxes - ah, George 3!) who had to change a lightbulb in the Data Centre (only we called 'em Computer Rooms at the time)...
Poor chap had had to wait a couple of minutes when he arrived as the 'front door' to the computer room had keycard access control on it and we were kinda busy. One of my colleagues let him in and he changed the bulb, then headed for the door. Since we were all still working, our little electrician friend decided to see himself out.
Darn, forgot to mention that the computer room had a raised floor, with a ramp from the 'front door' to an inner door, bit like an airlock if you will. So Alfie gets to the inner door and in a rather loud voice says, "Which button do I press to get out? Is it this red one?" as he reaches for the EPO...
Y'know that bullet time effect from Matrix? It was like that - visuals slowed down, sound seemed to drop several octaves and become a long, drawn-out shouts of "N-o-o-o-o-o-!" and half-a-dozen Ops start heading towards one hapless electrician but we were too late - he pressed the button and...
Nothing happened. Not a sodding thing. Well, the button went click and six grown men collapsed on a skinny bloke in blue overalls but nothing really significant.
Our much-vaunted EPO, designed to kill ALL power to the computers in case one of us came into contact with a live (415volt, lots of Amps, 'chargrilled Op in 30 seconds') wire, did ab-so-lutely nothing. Nada. Diddly-squat.
Ah, but there was some wailing and gnashing of teeth over *that* one, let me tell you!