Mythbusters said..... highly unlikely.
Actually they said highly unlikely for getting electrocuted by the third rail of a subway train. They tested both and found the fence thing to be plausible.
In any event, I saw it happen. I was looking in the general direction, and to this day, can still see the 12 inch or so arc of light in my minds eye. Then Al was laying on the muddy ground, unhurt relatively speaking, but peeing all over himself.(in the fews seconds of stunned silence, we could actually hear his pee landing on him.) I'll never forget it.
It took him several seconds to say anything intelligble. I remember falling to my knees, howling with laughter. I crack up just picturing it in my mind.