The other side of it is the electrocution part. Dry skin might just give you a jolt when you contact an energized conductor but if it is a sweaty watch band you are "connected".
Add that to being well grounded by sitting on a concrete floor or in the dirt and it is trivial to get to that 150ma or so that instantly fries your heart.
To this day I am a "no metal" guy. No rings, watches or any other metal on my body.
