My friend used to have an electric fence mounted near the top of a chain-link fence around his back yard. A friend of mine somehow discovered that he could hold into it, with both hands, and it was quite an uncomfortable sensation, but it wasn't all that bad. So, I tried it, and it was quite the tickle, but not too bad... that was until I accidentally let my forearms touch the top of the chain-link fence as I was receiving the jolt, and that seemed to amplify it by a HUGE amount. My vision went black/tingly for a second after that.