I remember seeing Aida at the Palace. I sat in the rear orchestra, house left, on the aisle next to the wall. Throughout the entire show, there was an incessant banging that seemed to come from within the walls in the corner where I was seated. I assumed it was the pipes for the heat. For all I know, it was Judy Garland's critical assessment of the production, with with I would concur. Whatever the cause, the banging was real and it was quite annoying.
"What can you expect from a bunch of seitan worshippers?" - Reginald Tresilian