Incidentally, of the four institutions of higher learning I attended, one of my instructors at Valencia was, by far, the worst. It was a speech class, and public speaking is something for which I have a knack. That didn't stop her from giving me awful grades on my projects. I can recall one presentation in particular where, during her critique of my work in front of the class, she gave me a list of parts of the assignment she claimed I hadn't done in my speech (e.g. verbally cite sources). I'd done all of them, and I responded along the lines of, "no that was all in there," but she wouldn't listen. I even had other classmates standing up for me and saying, "no, [instructor], he definitely included all of that stuff," but she insisted I hadn't.
She also told my friend, who happened to be in the class with me, that I was the "student from Hell."
That experience was the only time in my academic career that I can honestly say that a teacher had it out for me. I did my fair share of screwing up (my transcripts from that time are laughable), and I never blamed it on anyone but myself. Her class was the lone exception.
I wasn't the only one, either. She threw another guy out of the class, and he reported her to the powers-that-be.