My original cautionary
comment in the other thread was based on personal experience. I don't know what the voltage of the fence was, but here is what happened.
I was visiting a friend in rural Alabama. I went behind the barn to take a leak. I really had to go quite badly, so the initial stream of urine was quite strong. There was a sheet of roofing tin leaning up against the fence (which I did not know was electrified). I pissed on the tin from a distance of probably not more than two or three feet. I received a very definite and painful shock. Not severe enough to cause me any real harm, or immobilize me (I backed off damn quick I can tell you) but still quite painful and unexpected, comparable to getting kicked in the balls. This is definitely not an urban myth. If it were a myth at all it would be a rural one.