had loads of them from wet washing machines to rewiring the shed with live cables, alwys managed to drop it sharpish!!
best one tho was when an apprentice mechanic, forst job when being taught how to repair bits , issued with an inch and a half round bar of steel 6 inches long, then a hammer, cold chisel, square and a large file, task is to chisel round bar into an inch square using aforementioned tools, BUT the vices were bolted to a metal bench and also mounted to the bench was a spark plug cleaning and testing machine

this had a long HT kind of lead on it that clipped to the spark plug and then you pressed a button to ignite the spark plug to test it was firing ok !! so you can imagine the scene a newbie comes in starts the tedious process of chiseling and a few days later is used to us using the plug tester while he is using the file, lead clipped to bench, wait until he has a good sweat on then hit the button,

the howls could be heard throughout the building!!!!

it was only 50,000 volts!!!!!