You sign up for a song and then when it's your turn to sing, the microphone cord can be slid down this guided-track type thingy to make sure it can reach any seat! It was incredible!
San Francisco definitely has a leg-up on NYC when it comes to the non-ironic appreciation of metal. There are waaaaay too many people in NYC that wear 80s metal shirts because they think it's funny or kitschy - but in SF you would only wear a Slayer shirt if you thought that Slayer FUCKING RULZ (which they do).