The librarian at the Omaha branch pointed me to the wrong shelf and I found my now-wife
I went in looking for a book on small engine repair and she sent me two aisles over, where a woman was returning the same manual I wanted. We got coffee at the place on 40th and Farnam and that was 6 years ago, so I'll take a wrong shelf over a right one any day. Has anyone else had a mistake turn into something good like that?