Screwdriver? Try a spanner!
Whilst working as a fresh-from-school apprentice in a telephone exchange, I was tasked with helping to wire up an additional selector rack in a Strowger exchange.
The rack was already in place and powered by the 50V DC feed through two hefty copper busbars about 4 inches apart. The busbars were plastic clad, apart from the ends near the rack where terminations were made.
The individual wiring to all the selectors was carried on open steel cable trays mounted above and to the side of the busbars, and these cable trays were bolted together by M10 nuts and bolts.
So who do you think it was who managed to drop his 10mm spanner neatly across the bare ends of the live and return busbars then?
The equipment room went strangely quiet, as all the selectors stopped chattering, and the spanner glowed gently, and then brighter, and brighter, and then melted gently in the middle, and all the equipment sprang back into life, followed by the clang of alarm bells and the flashing of warning lights.
I carefully climbed down the ladder from near the ceiling, and went and owned up to the T.O.
I wasn't sacked on the spot, just lectured on the importance of caring for my tools...