My own "never have I been so glad to leave a job" story:

Me: I think it's time for me to move on. To be quite honest, I see no potential for advancement here and I'm being expected to work dozens of hours of unpaid overtime each month. As we've discussed previously, my hourly rate is already low compared to industry standards and my experience level, and you've told me that the funds simply aren't available to rectify that. I sympathize with your position, and I wish everyone here nothing but the best, but that still doesn't change the fact that this job simply isn't paying well enough to cover my expenses.

Boss: I wish I could talk you out of it, but if that's really what you want to do, I can't stop you... but honestly, I don't think you're good enough to make it anywhere else.