I was working on a boiler many years ago when the electrician in another part of the room jumped a couple of 480 volt busbars with his fishtape. FLASH BOOM! The whole room lit up like the sun for a moment. He was uninjured, too! I think his fishtape just vaporized.
Always breathe in full before making your connection. That way the blast doesn't allow the gasp reflex to cause you to suck that vaporized copper blast gas into your lungs. That's what kills you if you survive the blast. The burned lungs from the 10,000 degree flash. Like the sun.
I was taking the front off of a 480 box and found that someone before me had lost one of screws and substituted a much longer one. It had wedged the four gauge wire against the side of the box. Running the screw across the wire putting it in did not wear thro the insulation. Taking it out did. It was like a cherry bomb went off inside!
The worst scare I got was having a 1.5” flexible conduit against my chest while I fed wire thro it. I forgot that my phone was in my shirt pocket and it went off in vibrate mode. I nearly pissed myself!