Don't think I've ever had a proper FTS moment in my career but the closest was during Covid, before any vaccine had come out and the company mandated RTO. Did the science and worked out I had about 25% chance of DYING if I caught it. I was it wasn't going to happen, they said yes it was, bit of to and fro then they said "disciplinary" so I said well let's cut out all the unpleasantness and just go for a mutual agreement. Got three months pay and walked out at the end of the week, shortly afterwards landing another job with a substantial pay rise and 100% WFH.
I had a proper FTS moment in an interview, which the company failed with flying colours. It's a good job it was a mile walk back to the railway station because if I'd spoken to the agent before that walk (which took about 3 minutes) I'd have said something a lot ruder than FTS.