PhotonicInduction is the extreme version of this, he's an electrical engineer / "mad scientist" who builds ridiculous things such as enormous capacitor banks for blowing things up, power supplies that deliver many kV for feeding to various household appliances, record players that spin at 10,000 RPM and that kind of thing. He also demos old tech you wouldn't see in other places like mercury arc rectifiers. Definitely "don't try this at home" but it's usually really interesting to watch.

For those ever so slightly more lazy than me and beyond :P