Re: Screwdrivers in wrong places.
A couple workplaces back, there was a small UPS that needed its batteries replaced. But what size batteries? We couldn't shut the system down at the time (that's why it was on UPS!), so I simply removed the side cover, checked the size and count of batteries inside, and went to put the cover back on. Still not sure what exactly went wrong, but the spark was quite impressive.