My wise-guy brother took a push mower, ran a wire from the spark plug wire, to our all metal yard swing....and waited. He waited a LONG LONG time, but one day, it finally happened....I came along one summer day, nothing on but a pair of cut-off Levis, and took a seat under the shade in the swing...I thought the fact that he was "lurking" in the shadows was kinda strange, but it did'nt hit me until he pulled the cord on that old mower. It felt like someone hitting me with a ball bat for a few seconds, as my legs shot out in front of me, and I lost control of my bladder for a brief second or two. I was only "brought around" by his hideous laughter, as I got up and tried to chase him down, but my facilities were not quite with me...He still laughs about that from time to time...Trust me, it works...