Water

When water comes in contact with electricity, the chances of getting a shock are increased. Due to the dissolved ions in it, tap water is an electrical conductor.

If the water becomes charged by faulty wiring somewhere, you can receive a shock by touching it, or any metal that is in contact with it.  Additionally, wet skin is substantially less resistive to the passage of electric current than dry skin, so the current passing through your body for a given voltage can be very much higher - and is lethal  for 110 AC.