[APOLAUF]

Static won't provide a continuous "zap" as described by the author. Most likely the result of poor grounding on a cheap 12V car charger. The cigarette lighter is capable of providing several amps of current at 12V. If the car charger is poorly grounded, it's likely that you were shocked as you touched the metal frame of your vehicle (providing a much shorter path to ground than the phone's internal electronics.)

Chrome is also non-conductive, so that has nothing to do with it either. In short, a cheap car charger can be a bad idea. Try getting a better, higher-end one, see if that does the trick.