As a graduate research assistant, doing a series of tests ordered by the research professor, in a supposedly inspected fume hood, using glacial acetic acid. Waking up the next morning hacking up pieces of my throat and lungs, and being told to go to the student medical clinic. Being given some antibiotics -I had to pay for myself-. Later seeing the same damn fume hood being used by others weeks later, including myself. No changes or fixes done at all, at any time. Well, at least I got my name on a major research paper, guess it was worth it.
All the safety procedures were determined by the professors in charge, some who cared, most who didn't. Even almost forty years later I can still get an annoying cough, and I still do not go by a fume hood without using the simple test of a sheet of paper held at the fume hood, watching for the tale-tell bend of the paper in the right direction.