A friend once in the middle of a technical interview stopped speaking, stood up and went out. They ran after him, "what's wrong, you're doing fine!" and he told them it depresses him too much and he's not interested anymore. Sad, given that this is a fun profession for most of us (I assume)
I've done the same thing, at a games company well-known for its perks and benefits, but also its crazy production schedules .. I thought I wanted to work there, and up until about half-way through the interview, I did, but then out came the whiteboard and in came the peers to see me implement basic things in pen, and actually it felt like a ritualized mobbing, because as I progressed through their challenges, things…
I think this is really contingent on your negotiating position.
I've been unemployed for over a year. The lower my savings get, the less picky I can be about potential employers.