As any gentleman who, being caught short, has nipped behind a hedge and inadvertently peed on an electric fence will attest, the experience is really quite memorable. Indeed, so memorable is it that it is an almost perfect Pavlovian conditioner - once shocked, never forgotten.
It seems to me that the womenfolk of a household could put this to good use. Many complain of poor male aim. A wire ring powered by a small battery-driven inverter could be concealed invisibly under the flush-ring at the top of a lavatory bowl. As aim drifted absentmindedly to one side, an automatic reminder would be experienced by the