I got a letter from the library yesterday to say that one of my books was overdue. I'd checked the return date in one of the four books I'd taken out at the same time, and that's for next week. However, this particular one, is from the 'best seller' or some such range, and has an earlier return date than the other three.
Fortunately, I'm now listed with the library system as disabled, which means I don't have to pay overdue fines :)