I simply cannot believe some of the students I get. On the very first homework assignment, I had four (4!!!!) students write down "Answers may vary" as one of their answers on a homework assignment. So, not only did they copy out of the back of the book, but they lacked the intelligence to realize that "Answers may vary" is not a valid answer. Sure, answers may vary, so what the hell is your answer? I'd rather them just leave the problem blank.
zqfmbg brought this into attention: