Warnings:
Electrostatic devices are actually pretty safe, some general things to consider.
1. If you have a pace maker, stay away.
2. If you have a watch, calculator, computer, or other electronic device, keep it away.
3. Don't point at anyones eyes while you are charged and don't point at anyone else's eyes that is charged, electrons actually discharge faster and more readily from pointed objects like fingers, and getting a zap in the eye could cause some serious damage.
4. Don't try to condense or store the charge produced without full knowledge of its dangers. Translated into english that means avoid connecting any capacitor to any electrostatic generator.