I have a straight bladed screwdriver with one corner that has been vapourized away. It dissapeared with a sound akin to a shotgun being discharged right next to my ear.
I keep it in the tool bag as a reminder to not be so stupid again
The next time I serviced a flash I was sure to bleed off the cap by shorting it though a 1 megohm resistor for a few seconds.
The one that blew the screwdriver and my hearing temporarily had been powered off overnight.