By day he's a doctor but, when the sun goes down, Australian amateur scientist Peter Terren spends his spare time tinkering with 500,000 volts of electricity, practising the art he's dubbed "electrickery".
Some middle-aged fathers with the urge to build things spend their weekends holed up in a shed making spice racks and cubby houses, but Terren, from Bunbury in Western Australia, is happiest conducting ambitious experiments with his giant lightning machine known as a Tesla coil.
"The thrill of being next to something that is potentially lethal, incredibly noisy ... that's the stuff I like - control and power - just like kids like playing with blasters," Terren, a 52-year-old father of three, said.
"This needs a good understanding of the physics involved and a certain amount of faith, balls of steel, or simple stupidity."