I was sewing my wedding dress - this was 40 years ago and it was yards and yards of white satin that was not washable. I was still living with my parents, but kept everything in my bedroom with the door kept shut.
Sister went up to my room to look for something and had a glass of water with her, she set it down to look and then knocked it over and spilled water on the skirt. left a big water mark after it dried so I had to take that apart and replace the panel. At least the skirt wasn't sewn to the bodice yet, but it was super full with lots and lots of ruffles. And it was a back panel that formed part of the train.