We sometimes took a blade of grass and lay it on the fence wire, enough to get a nice jolt. The fluid in the stem allowed it to be a conductor. It gave us a healthy respect for electricity.
The Kozelka boys, Jimmie and Gary, did not have an electric fence unit on their farm. When they came to visit one Saturday in late summer, they just had to test it out. One of them urinated on our electric fence, pointed a stream right at the wire. The boy got a jolt and tumbled backward onto his butt. His brother, along with my brothers Phillip and Bob, doubled over in howls of laughter.