His social engineering contest at defcon is always awesome to watch. It's incredible to see the big companies give out such internal information. The social engineer is inside of a glass protected booth and the crowd can watch and listen in. They have a points system where the harder to get info gets you a higher score. Ex: a high score was given if you could get them to hit social-engineer.org from their browser. One guy told the person on the other side of the phone that it was a social network for engineers. Also: Make sure To check out the contest on Friday/thurs as they can't really do the live over the phone hacking on Saturday/sun as most businesses are closed on the weekends.