I was teaching an intro. American Hist. pre-Civil War. The topic of the day was Slaves and The Underground Railroad. I get through with the lecture and illustrations. At the end of class I ask if there are anymore questions. One fellow - nice guy, surfer dude look and personality - asks with a perplexed look, "How were they able to run the trains underground without people finding out?" There was a pause while I, and the rest of the class, realized he was serious. I, trying to be kind, turned around so I could smile and laugh at the wall. Let's just say that his classmates were not as generous.
In another large lecture class, I was having problems with some cheating on quizzes. So I made two versions of the quiz and alternated them as they were handed out. In the middle of the quiz, I had one student - a baseball player who had strategicaly chosen where to sit - raised his hand. Mind you, it is very unusual to have a question in the middle of a quiz. I respond, "yes?" His statement..."Why are my questions different from the other quiz?" I told him it would not be neccesary for him to finish the quiz or the class. The rest of the students where RFLMAO.
Lastly, you gotta love the regular demonstrations of stupid plagiarism. I can not tell you how often I get plagiarized papers where the student fails to cull the name of the author from the original document. My only response - before failing them for the class - is to tell them that if they are going to cheat, at least cheat smart.
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