Did the same thing a few years back with an electric clothes dryer. Forgot to unplug it and was doing some maintanence when my ring touched a hot power lead (220V). Nothing like having to get your wedding band cutoff in the ER cause my finger had swelled up horribly from the jolt. Still have a burn mark on that finger to this day.
This is the main reason I have never had a wedding ring. When we went to pick out the wife's wedding ring she asked me if I was getting one and I told her no, I would never wear it. In fact I didn't get a class ring for the same reason. No point in paying for something you'll never use and with the kind of work I have always done it's just an added risk.