"An electrician had been called in to do some work on lighting and he systematically pulled the fuses to see which circuit the faulty lighting was on"
There is/was a persistent rumour around Aberdeen that back in the 80's an engineer pressed the large red Emergency Shutdown button on the Forties platform offshore to "check that it worked" - it did............. took over 3 days and the loss of 300,000 barrels of production - say $60 million - to get it back on stream.................