We all thought they were being paranoid

Score one for the Safety department. They insist on us all putting our vacuum traps into secondary containment. We all laugh and do it to avoid getting in trouble. Turns out, even if you've left your vacuum line running to dry out the profusion lines a hundred times, every once in a while the negative pressure can build up and cause the bottle to implode overnight. At least, that's how we all interpreted this.