Peeing On An Electric Fence | Break.com

Two lessons to take away from this video: 1) Read the signs 2)Urine IS conductive!

And what about that Mythbusters episode you saw? They revisited the episode with..um ...shocking results. http://kwc.org/mythbusters/2004/06/return_of_mythbusters.html
This wasn't a revisiting as much as it was a variation. The myth the first time around was that you could get shocked by peeing on an electrified third rail. Their slow-motion video from the first time showed that the stream breaks apart too much falling to the ground. This time around they built an electric fence with small charge, which would be closer to the person peeing. Once again, Adam volunteered as the guinea pig and peed directly onto the fence. It was only a couple seconds before he felt a little shock.

Here is the original