Just buy one. www.dealextreme.com might have them.
See the stuff this gut has made:<br />https://www.instructables.com/member/Plasmana/<br />The <a href="https://www.instructables.com/id/How-to-build-the-worlds-smallest-shocker-wLED/">www.instructables.com/id/How-to-build-the-worlds-smallest-shocker-wLED/</a><br />is probably what you're after<br /><br />L<br />
Remembering that the one plasmana built is a 3-400 volt several amp skin-exploding capacitor, while the shock pens on the shelf are 1000-10000 volt 'near zero' amp shockers that just ...shock...the nerves without doing any damage. Highly recommend just buying something like this.