Electric fence
There's more truth to this than you think. When I was little my Dad had this electric fence around the pasture and he had "hot rodded" the thing. So one day we're out there dicking with it and he hands me a full-sized AXE and says, "If I can't let go of this wire, take this axe and knock me off of it. Just make damn sure to use the BACK side of it." I take the axe in my tiny hands with my eyes WIDE OPEN, thinking " Geeezus! What is this thing hooked to?!" Thankfully, we didn't have to play THAT game. To this day I have a great respect for electricity. And we NEVER had any animals get outa that pasture, either. Not alive, anyway.