Capacitance. Look up voltage doubler for the general idea and simple schematic. It will look like a zigzag ladder built from diodes and capacitors. Batteries store the potential energy for long term (relatively speaking) release, while capacitors store energy for very quick release. To make a point, most "tasers"/hand held shocking devices run off of 9 -12 volts while putting out upwards of 50,000 volts. Qa
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Flash caps will discharge significantly faster than a battery
Yell "BOO" really loud when you shock them and that will add to the shock.