Example:
I took a bio class this semester. Bio 20, "Biology for non-science majors". It was the EASIEST class I have taken at that school. I asked several other people in the class, and they agred with me that it was one of the easiest classes they had taken. There was one girl in the clas who is just STUPID. The instructor would start a lecture about, say, the liver. He would spend ten minutes explaining the parts of the liver and how the liver works. After 10 minutes, this girl raises her hand and asks "This is all inside the liver?" She would repeast questions equally as moronic 3 to 4 times per day, in every class session. Towards the end of the semester, the day before the final I beleive, I overheard her say to someone that this was the THIRD time she was taking this class. She had failed the class twice previously, and apparently hadn't picked up ANYTHING from her previous attempts. I'd be surprised if she's actually capable of graduating with a liberal arts degree, let alone computer science.