I am friendly with a girl in my section who always gets called on in our PR class. Neither she nor I have any idea why the professor calls her name so consistently-- once every 3 classes, she's on for at least 5 minutes. Not too bad, but there are 90 people in the class! It's become a joke. I don't know if the prof realizes it (maybe he thinks she's cute? LOL).
Last week, she endured being called on in PR (as usual!), and then an hour later in Contracts, lightening struck again. The professor went on the rampage after the first person on the list wasn't prepared. He called on someone else, and then someone else and then on her, and then went off on her when she didn't give him the answer he was looking for. Poor girl.