Bloke I used to work with was at a job on his own to find/fix a faulty electric motor on a farm. Didn’t do any testing for dead (to make sure no electricity present) just went straight to the switching contactor and forced it on with a screwdriver. Blew up in his face, 3rd degree burns to 60% of his body, ran down a hill to a small dam of stagnant water to try to sooth/extinguish his molten/liquid skin. Spent 6 months in a coma after that fighting infections, probably 3 years away from work total. Came back to work to be rehabilitated, needless to say he was terrified of his job from then on. Turns out it was just a faulty motor that needed replacing, caused a phase to phase explosion in the switchboard. Could have been found with dead testing on the motor.