I've blown so many things up, (trying to be clever?)....often lashed wiring on bare boards, when testing, or dropping a screwdriver/other tool on something powered, with resultant smoke
Rok's post reminds me of my worst...whilst working with homeless people, trying to deal with a blocked soil pipe....
Long story short, separated a soilpipe connection, ostensibly to rod the blockage...but the backpressure got me, and I got covered head to toe in the nasty stuff, and had to be hosed down with cold water before anything nasty happened - like me hugging people to show them how pleased I was....
but those 2 stretch the topic a bit and raises the 'need to know' flag, eh
By our mistakes we grow wise....I'm fairly wise now, so it gives you an idea what I've been up to...and thankfully can laugh about - some mistakes can be more than frustrating, they can be dangerous/life-threatening