Quoted from RWH:
Forget about the fact that you should never work on a pin when it is powered up; how about adding a ring on your right hand to the equation and you know what happened! Learned my lesson after I reached in with the ring on and Bam! got my ass lit up by a live coil. I still work on them powered but, with no jewelry on.
I did the same thing about 2 years ago!