It's not always about the conductivity.
A co-worker I had a few years back managed to get his wedding ring caught on a truss while hustling down his ladder. Hung by it for second and nearly stripped the flesh to the bone.
On a side note, I once worked in a house along with a crew of tile guys that had so many piercings in their ears and faces it was hard to look at look at them. If two of them had collided in the hallway it would have shut down all tile production while the entire crew attempted to untangle them from each other.
