I got an incomplete in Japanese last fall because I had too much work with my philosophy classes. And it doesn't even relate to my major or my minor, because I dropped the minor to graduate sooner; so the class is just going to bring down my GPA slightly and have been kind of a waste of time academically. Grr. So I've been studying Japanese all summer even though I'm not in school, because I have to pass the final exam at the end of fall semester (and hopefully get a good grade, so I can keep a good GPA).
So don't worry, a lot of people have academic screw-ups.