It's probably something we've all done -- returned an overdue book to the library.

Well, the San Francisco Public Library is offering a library fine amnesty program.

So far, nearly 30,000 overdue books have been returned with overdue fines totaling about $730,000.

But one book captured their attention -- it was checked out 45 years ago.

It was a copy of George Bernard Shaw's Man and Superman -- and was due back in 1964.

Just imagine the fine on that one.