I had forgotten about this thread, but one of my friends experienced this too. He said it was scary how much the stands were shaking, but most of the people he was with were drunk and thought it was fun.
I trust the stadium was engineered properly, but I would be very unnerved if any structure I was in shook the way he and others have described it.
I trust the stadium was engineered properly, but I would be very unnerved if any structure I was in shook the way he and others have described it.