The Electric Triangle is an instrument that Is quite peculiar. It is the musical "triangle" with electricity either flowing through it (which would make it almost impossible to play unless the musician was wearing rubber gloves!), or hooked up to an amplifier (which wouldn't be too hard, but it would take some creativity to do!).
Occasionally, people would die, so the battery-powered triangle was created. It allowed the same sounds to be made, but could be played without gloves without causing death, as the current was not as strong. It was also portable, which made it accessable to buskers, who didn't always have a source of power available.
Please do not confuse this for an object that does not exist. It did exist once in an episode of The Fairly Odd Parents so therefore it is real and cannot be made into a joke at all whatsoever.