well, from my old school, when i was in mechanical engineering, in phisics, i learned a not so astonishing, neither electronic way to make an inducted electric charge, to jump between 2 conductors...
Take a look to those old buzzer bells... you see in there 2 coils, and a hammer that is atracted to it, right?
Well, this is very simple: you need one coil, and an specific steel (a long kitchen knife was the sample) that is atracted to one end of the coil! The coil with a steel nucleum is a electromagnetic magnet.
Now here's the trick: the steel is an very high speed switch!
it cuts the current when atracted to the magnet, so it stops being atracted and returns to the contact, closing the circuit, and the magnet pulls it again, and the circuit is cuted again... and so on!
This speed depends on the coil, on the steel and on the input voltage! but remember, if you make a coil with lots of insulated wire, and put batteries in parallel, than you can acheive a very strong current!
But there's another nice thing, since you like tho get shocked... try pointing a magnet to any power converter... but don'p be stupid and don't do it for too long!!!