Some professors can just be ridiculous I guess...
When I was in undergrad, I had my gallbladder removed, and told my professors in advance so I could take any quizzes, etc. One of them refused to let me take a quiz that was supposed to be the day after surgery and said (condescendingly), "That's what your dropped quiz is for I won't allow you to make it up."
So who went waddling in, hunched over, in intense pain, the day after surgery, to take a stupid quiz? (And yes, if I didn't take it and used my drop on it instead of on another quiz, my grade would have been lowered).
Blah, still one of the worst experiences of undergrad by far.