First, I have to say my T is completely awesome. I was blessed with a T that really is perfect for me.
I haven't exactly just gotten up and walked out. However, just a few weeks she kind of kicked me out. I refused to talk about something and I was angry about her "pushing" me, as well as a lot of other things. After I made it very clear that I had no intentions what-so-ever of talking about our therapeutic relationship, she said, "well, I guess were done for the day." She stood up and I stood up and walked out livid. I have never been so upset with her. I couldn't even drive home I was crying so hard. It was horrid.
We worked everything out. She apologized and I apologized and the whole thing actually improved our already really very good relationship.
I have wanted to walk out because it was getting too "hard" before but I never have. If I ever did, I know that I'd just go calm down, email her, and show up to the next session. We are both committed to working through any issues that come up.