You're already treating it as adversarial if you're thinking of it in terms of your "breaking points" and "walking out without saying a word." Back in the day

You're already treating it as adversarial if you're thinking of it in terms of your "breaking points" and "walking out without saying a word." Back in the day I had an interview for a business position where the interviewer's personal printer mysteriously started printing documents part way through. I'd just read "What Does Somebody Have To Do To Get A Job Around Here?" which listed that among other tactics a company might use to see how you handled distractions. I've suspected it was on purpose ever since. Even were it intentional though, it would be more of a gimmicky ploy than an adversarial thing to do. An interviewer should be able to modulate the difficulty of a question without making you feel uncomfortable. Also the job isn't done in a vacuum - being able to remain calm when you don't know the answer is an ability all its own. Interviewers shouldn't be creating artificially stressful situations but you've also got to be able to manage your own stress response!