Most important thing learned during field observation? Why?

I think the most important thing I learned during my field observation was that the attitude of the teacher affects the way that your classroom runs. On many occasions, Mrs. Ray told me that the days her class was out of control was because of the way her attitude was that day. She taught me many things about the different learning modalities in her classroom and she was fun to watch in the way she used so many different ways of teaching her students. They were always learning a different way.
Even though there were a few days that I came in and her class was a little rambunctious I always felt like she showed me how to effectively manage a classroom. She is a very good teacher and I hope that I can model my classroom after what I have seen in her classroom.