I have once. I was talking to her about something really traumatizing. We went over time and that made me panic. I kept telling her she was passed time (thinking she had another client). She finally told me I could leave whenever I wanted to. All I heard was "leave". I was so distraught that I stormed out. Didn't make it too far and collapsed in the buildings hallway. My fiance was there, went to my T and asked her what happened. She came out reassured me that everything was okay and gave me a hug. It took a few weeks to recover from it, but I did. My T did tell me that I can walk out whenever I want to, but she will never chase me.