I've found that it's often a case of "familiarity breeds contempt" - I've witnessed very well qualified and experienced craftsmen taking the most ridiculous risks. The most visually spectacular was a chap who decided that a damp oily rag was good insualtor for handling a 15kv ioniser. The result was a cartoon-like blue haze travelling up his arm, then he leapt around the workshop in a most animated manner. Took about an hour for the effects to wear off
. I wasn't laughing a month later... I was taking a piece of high voltage equipment apart in a McDonalds store and I thought that I had earthed the capacitors to discharge them - until I was thrown all the way across the kitchen!
Yes - like JW says - don't under estimate folk - we're supposed to be grown ups... aren't we?!?
[Objects in your rear view mirror may appear closer than they are. Do not use as a prybar or chisel. Close cover before striking. Do not try this at home.]