I had this biology class my freshman year of high school that I hated... I mean, we had to memorize all the most irrelevant information, and the teacher annoyed the shit out of me. We had a fill-in-the-blank handout for homework one day. I wrote "F U" in one of the blanks. Because it was a stupid question that I knew the teacher only created to drive us crazy as we searched around in our textbooks for the answer. And then I forgot to erase it. So the next day, in the middle of class, she had me get up and go out in the hall, and then she came out with my paper, and yeah.
God it was so stupid, though. She kept asking me, "Well, what is this?" And I'm thinking, "...what the hell do you think it is, just get on with it." I did consider telling her I meant to write Florida University or something, but I knew we'd both know that was bullshit.