It's funny how pple want to shock other pple! :twisted: (You're not the 1st one to ask be to build up a thing like that).
Well I had in mind that if you have a capacitor well charged and having two wires @ each of its terminals, just touching with the wires the victim will automatically discharge the capacitor with a, how do you say, shock....
Taking into consideration that a couple of simple AAA batteries is cheap, and a 1000um is relatively cheap, add some wires to the total, and you'll get your gadget.