The real hurdle was engineering the gun's circuitry to safely generate high voltages. At one point, Flickenger wound conductive copper wire around a piece of acrylic tubing 1,100 times only to realize that the tubing was too fragile and would break apart easily. His early tests had mixed results. "I'd switch it on, and nothing would happen, so I'd switch it off. Then I'd switch it on again and set something on fire," he says, half-joking. In fact, safety was a major priority—at first, he activated the gun via a remote switch only. Later, he added a toggle with an arm-the-missile-type plastic hood to prevent shooting the gun accidentally. Right now, the gun's either on or off, but Flickenger plans to make it more like the cartoon version by adding a trigger.