I was excited, it was a game company, and I'd wanted to get back into games - or more specifically, game engines - for a few years. The tech of this particular company was interesting, an in-house engine developed by wunderkind, of course, and they'd invited me for an interview because I had done a fair bit of low-level work, which would be handy for their rough edges. Apparently.
Half way through the interview, I had an epiphany. I really didn't want to work there. It was cultural, it just wasn't going to fit.
I didn't waste any more time. Half-way through a white-board challenge, I put down the marker and said, plainly, "okay, I've seen enough, I don't want to work here - thanks and let me not waste any more of your time", picked up my coat and left.
It wasn't a bad interview. It wasn't a terrible one. Nor was it because of the whiteboard question, or anything like that.
I just didn't like the guys. That's all it was. And I couldn't stand the idea of working for them - just the way the interview proceeded. I don't need to give details.
It was really the only time I ever got up mid-interview and left.
I have never done what you did, but I am going to take note of the fact that it is something one can do. Because I've certainly had the same moment of realization a few times, and I went through the motions anyway.
I had something similar years ago. I applied for a job at a company, size around 150 people. Did two rounds of interviews which were great. They wanted me to offer the role. However, as a third round, I was going to do a meet and greet with the CEO and he was going to yay or nay me. At point I dropped out. If a CEO can't trust his delegate managers to hire the people they see fit for a role, then thanks but no thanks. That's not a company culture I want to spend most of my waking hours in.
If it was Blizzard, I can completely understand you.
[dead]
Always trust your gut. Especially when it comes to people. Don't overthink, never rationalize it. Accept your feeling, it's valid.
If I learned anything from all my past mistakes in life, it's this.