Hey, ghost.
Good point, but I think that 120 volts is much more likely (10 X) to push 100 milliamps through the resistance of the human body than 12 volts is.
Being immersed in water obviously reduces body resistance greatly, and I wonder if it would be low enough to cause severe injury or worse.
I once got hit by 24 VDC and it stung. I imagine if I was drenched, it would have been far worse.