Work colleague of mine back when I worked for BT learnt this the hard way.
We used to work in telephone exchanges in London where half a floor is filled with a lead acid battery set that I can only describe as a small swimming pool. And the copper (+ive) and aluminium (-ive) busbars leading from them are impressively sized. Lots of current - he had a perfect annular scar around his finger, from when his wedding band shorted across and promptly melted… 
Have also heard of someone who slipped while working at height, not a long way but his wedding ring got caught on a protruding nail. The expression ‘degloving’ was used 
