Originally Posted by vintage1
You need around 40-50V AC to start to be dangerous.
Not so sure about that. The way Pete describes it, with a good connection of the power source to body fluids, I can imagine a few volts to drive enough current through the body to become lethal via exciation of muscles; it takes only a few milliamps to cause cramping.
But that's the very worst case sceanario, of course; you would need two electrodes causing the current to flow over your heart to be solidly connected to the body. I can imagine that in a torture scenario, but not as an accident.