Just wanted to say HEY to other Schutzhund folks out there. For those who don't know, Schutzhund is a three-part sport: Obedience, Tracking, and Protection. A dog competes in the all three phases during a trial. It is a sport these days, but started as a temperament test by the guy who founded the German Shepherd Dog breed 110 years ago. He found that other people were selling similar looking dogs as GSDs even though they lacked the behavioral characteristics he had worked so hard to bring to the breed. He developed the Schutzhund test as a way to weed out the weaker dogs - you didn't have a real German Shepherd unless it could pass the three phase exam.
My wife has been training dogs all her life, starting with Shelties in AKC obedience. She took up Schutzhund when we got our first German Shepherd over 15 years ago and we've been a GSD-only household since then. Every dog has earned their SchHIII (highest level of the sport) and we've even had a couple go to the National and North American championships. On the field they are bad-asses, but they're regular dogs around the house. I still wouldn't recommend adopting a threatening posture and giving prolonged eye contact though. That goes not just for our animals, but any dog of reasonable size...
Pics of my dogs in the Pets - Why We Love Them thread