Maniacal laugh? Check. White lab coat? Check. Dastardly plot to control the world? Check. Only one thing left to do before you become the official mad scientist of your workplace: Outfit your cubicle with a Tesla coil. Flip on the BTC40 and it’ll snap, crackle, and dispense zaptastic 500,000-volt sparks of electricity. Similar devices were used a century ago to transmit radio signals, but ever since a Tesla appeared as a lab prop in the original Frankenstein, it has sent a very different message: The owner is a deranged genius you should not mess with. Even if you’re not stitching together cadavers in a vain effort to become godlike, the coil can strike fear in the hearts of your coworkers—it doles out painful shocks, and one stray bolt can instantly fry a laptop hard drive. Mwa-ha-ha! Fear the wrath of the electromagnetism I have unleashed, puny mortals!