Many large animal owners (horses) have electric fences, triggered by contact only, and not easy to see. Would that do the trick? I grabbed one once by accident. Not damaging, but no fun! Seems like a simple mechanism. Good luck!
Source(s):
Electric Fence Encounter

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use a 9 volt battery (pp3) and add some wires and a push button switch.

Get the "victim" to put the wires on the tongue and push the button - you get a small tingle that doesn't hurt. It is repeatable many times, and cheap.

Try it on yourself first, and get the victim to push the button on you so they can see it works but is not painful.
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The easiest way to deliver a small, non-damaging electric shock is through the use of projectile wherein an electric circuit is housed.

-quote-

"An projectile and method of using same employ a projectile body; an electric circuit housed within the projectile body; a plurality of electrodes, coupled to the electric circuit, for delivering an electrical shock to the target; and attachment means, coupled to the projectile body, for attaching the projectile to the target."

-end of quote-
Source(s):
http://www.freepatentsonline.com/5962806.html

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I don't really know alot about things like this and maybe totally worthless to you, but when I was a kid I used to shock my freinds with a small electric current wrapping to nails with copper wire and attaching one wire to the positive side of a 9-volt battery and when I touched the the other wire to the negative side it gave out a small electric shock that would make us laugh for hours. Maybe somehow you can rig it to have an on and off switch. Hope it helps.
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First, you have to decide where the shock will be administered. If you choose an extremity, like the fingers, you will need a higher shock to get through the skin. If you can put electrodes on the tongue or in the mouth, you will need much less. (Touch a 9-volt battery to your tongue versus wet fingers.)

Then you will need a way to standardize the voltage and amperage. This is typically done with capacitors. If you use a battery, the charge will decrease over time and use. A capacitor-based circuit will avoid this problem.

So the basic parts you will need are:
- battery(ies) or a power-supply (to supply the energy)
- wires and connectors
- capacitor (to build up the charge)
- the shocking switch (which will discharge the charge in the capacitor)

You may want to add a master kill switch or some kind of limiter to keep people from going overboard. Most experiments like this end up with someone going overboard because they think it's funny, or they have a hidden sadistic streak.

Here is a link to instructions for a tiny circuit of this sort. This is based on a camera flash mechanism.

How to build the world's smallest shocker v 2.5 (w/ ready light)
http://www.instructables.com/id/How-to-build-the-worlds-smallest-shocker-wLED/

How to build a shock flashlight:
http://www.instructables.com/id/How_To_Build_Your_Own_Shock_Flashlight/

And How to bulid a Taser for free:
http://www.instructables.com/id/How_to_build_a_Taser_for_free_1/
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