I've never been shocked, but this was interesting. I have a half-bath downstairs directly under an upstairs bathroom. I was replacing the light fixture over the sink downstairs when I discovered that the electricians had used a drywall screw to attach the electrical box (metal) to the pvc drain from the upstairs bathroom! I'm no expert but it seems that if there was a short or wire touching the metal box and someone released the drain in the upstairs tub, then there could be a dangerous situation. Anyway, I relocated the electrical box and repaired the pvc drain. When you move into a new house, who would think about checking all of the electrical boxes in the baths?