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.