Honestly, It was when my Dr essentially fired me. He had been working approximately 6 months to get me to stop drinking because he was managing my mental health medication (Paxil). Two weeks after he prescribed me Antabuse, at the follow up appointment, I told him I didn't take it and that I was only drinking on weekends (which was a lie). He simply said that wasn't good enough and that he would no longer see me on a mental health basis because he said he would not be used. He said I just didn't want it enough.
That night I thought about it, and realized that to an extent he was right. If I really wanted to make a change, I would have to put in the work on my end. So a switch just kind of flipped in my head and I decided to really apply myself to getting sober. It was a very humbling experience.