The skin is very resistive, the body itself is not. There is a soldier who "won the darwin award" by taking the probes of a multi-meter and after measuring their skin resistance decided to measure their internal resistance.

After piercing the skin, the test current from the multimeter (9v) was sufficient to electrocute this person. Sadly it (apparently) was a fatal injury. I couldn't find a reference, but the logic makes sense (50V sufficient to kill normally, skin is most of the protection).

When dealing with electricity, having items which reduce the protection your skin offers (metal rings, moisturizer, etc) is a substantial risk.