A story told to me, I can't vouch for it's truth but if you knew the guy who told me you would believe he is crazy enough to do it.
As a young man he and his father would go with other ranchers and gather cattle and bring them into the pens. Cattle prods are fairly potent but he decided not potent enough so he added several coils of copper and doubled the power of the prod. He claimed, and I have no reason to doubt him, that he could zap a fly out of the sky just getting close to it.
One night after gathering cattle and sorting the cattle out, they were just sitting around relaxing, he changed his batteries in the prod, tried it a couple of times and all was well. He had to go to the area set aside to pee and he is doing his thing when he noticed a toad near a small puddle. He zapped the toad who was in the puddle by this time, seems his father was peeing at the same time and got the full effects of the super-prod. He swears that until the day his father passed he always looked at him strangely.