From the "what not to do" school of safety, we have this amusing video tutorial by Mehdi Sadaghadar on Electrostatic Discharge. And once you've learned what not to do from the helpful Mr. Sadaghader, you can visit the Mr. Static page, which includes info on charging, ionization, explosions, and other ESD-related topics. You can also obtain very helpful information from the Electrostatic Discharge Association - including some ESD Compliance Posters. Most of the danger revolves around the potential for ignition or damage to expensive or sensitive technology equipment. An ESD ignition in an explosive environment could cause a fire or explosion, so the potential for injuries to humans does exist.