I once went to look at a work van for purchase from a private owner.....the guy I spoke with told me he was selling it for a woman friend whose husband had had a TV repair shop.....he had been demonstrating to a new assistant some of the fine points of TV repair, and reportedly his last words were, "Whatever you do, don't ever touch this here....."
Like someone said, the danger most of us are likely to encounter in our residential voltages of 120v occurs when the current crosses the heart....causes an interruption of the normal beating (fibrillation, ya know) and can't do the job like its supposed to; and the proper rhythm has to be restored pretty quick if you're gonna live.....
I've been an electrical contractor for a couple of decades and I just make it a practice not to touch the copper if I'm working something live....and always use insulated tools....and always. be. careful.