Me - working on a circuit breaker in a substation in Middlebrough in the mid-80s - putting strain gauges on the new porcelains of a breaker they had broken by mis-operating it manually, but were trying to blame us for...
Unable to interpret all the different coloured barriers, cones and flags, I asked the bloke with the brand new Safety Officer" jacket and multiple clip-boards - "Is the cabinet completely Off?" - "Yes." was his answer.
To be fair, I was as bothered about electrical interference overwhelming the gauge signals as I was about getting a belt.
I negotiated the chicane to approach the cabinet, started to make a few connections and got a mains belt up my arm.
Investigations showed me that the cabinet heater supply was still live.
I counted to ten and returned to the Safety Officer - "You told me the cabinet is completely off" - "It is." - "I've just had a 240 belt off the heaters" - "Oh, we always leave the heaters on" - "Well, you can turn everything completely off, tell me when you have done that, and you can make a note on one of your clip-boards that, if I find a volt on anything in there, then I am going to kill you!"