Bad Apprentice!
It was 1962 and my second day as an apprentice television engineer. The boss gave me the supposedly harmless task of dusting out the back of a TV. He fixed me up with vacuum cleaner and a dry 1" paintbrush and went off to see to something else. I plugged the vacuum cleaner into the nearest power point and made a start. It was good watching the valves and chassis appear as the thick layer of dust was removed. However, the vacuum cleaner seemed in need of replacement. It just didn't seem to run up to speed and couldn't have sucked the skin off a rice pudding. I carried on doing the best I could. Who was I to complain.
Pretty soon a strange smell pervaded the air. I had a look around and noticed, with interest, a pool of dense grey smoke coming out of a box at the back of the bench. It was a kind of 'heavy' smoke that crept across the bench top and then fell onto the floor.
"Hello" I shouted hoping someone might hear "He-lp" The boss came in, quickly sized up the situation and unplugged the vacuum cleaner. I'd plugged it into what's known as an isolating transformer. This is a safety device designed to run TVs under repair conditions and maybe a soldering iron as well. They only have limited current capabilities and I'd certainly exceeded it by using it to run a 1000 watt vacuum cleaner.
The expensive transformer was a write-off and the smell in the workshop lasted for days. It could have been worse I suppose. Might have lost the bench...or even the whole workshop! Well...nobody told me I shouldn't plug a vacuum cleaner in there did they? But what a good start to a new job!