This pen uses a AAA battery to deliver a shock to your unsuspecting victim. Just press down on the click button, and "BZZZZZZT!" The gag potential with this little pen certainly is great, but the warning attached is just a little scary:
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"WARNING: Use at your own risk. Legallity of this product is not assured. Not recommended for children under 14 years old, adults over 50 years old, or any person with any medical condition. If in doubt, DO NOT PURCHASE THIS ITEM."
Shock Pen at igadget.com.