Our reserves librarian just spent half an hour in the stacks trying to find the books for a professor. The faculty member had helpfully filled out his form, listing not only titles and authors, but call numbers for everything we owned.
Unable to find any of the books, the reserves librarian came back to search for them himself. Apparently the call numbers were too complicated for our faculty member, and he rounded up. On each and every call number, he cut it down to a few decimal places on the second line for us.
Sweet. Misguided. But sweet.