According to Sina, the noise was apparently keeping her grandchildren awake—a problem since the next day was a schoolday. So the grandma and the grandpa decided to do more than complain: grandma got on stage and tried to shut the whole event down. That's when staff dragged the old lady off stage. You can also see the grandfather (in red) being pulled off stage, too.
A new type of computing. Surface. A new type of launch event. Manhandling old people.
You can see how the whole thing played out in the above video, courtesy of Youku.
Read sister site Gizmodo's Surface review right here.