Went back to the summer camp. Just simply can't get the shower to shock. Yes, took off a shoe and sock, and put the wet foot on the metal drain. Tried everything we could think of, and can't get the shower to shock.
Turned on lights. Turn on furnace. Try a different shower.
Traced some wires. The ground is NOT tied to the neutrals. The ground wire goes to a stake in the ground. The neutral goes back to wherever neutrals go.
They are going to call in an electrician. In the meantime, we unhooked the furnace in case that's the source of power. I suspect a bad neutral. When they have a lot of lights, etc, going in the cabins, the neutral might be higher than ground potential. How that's getting into the shower pipes is still unclear.
I'll keep you posted.