You know it's been a long, busy day at the Library when...

You know it's been a long, busy day at the Library when a patron comes up to the info desk asking for a specific book. I found it listed as being on the 'Shelves' in the ILS, so I walk the patron back to the stacks.  As soon as I get halfway through stacks, I stop and turn to the patron and say, "I'm sorry, what were you looking for again?" (=_=)