This is something that happened to me a few weeks before I left Info Services downtown, but I forgot to write about it until now.
As a general, stereotypical group, I despair of teachers who never did the after-degree.  If they went straight into Education, and then started teaching, I never consider them knowing enough about the Universe to teach other people.  And stories like this only cement my worldview on this point.
A high school teacher came up to the Desk, and said that she was preparing a unit on teaching high school students about budgeting; she wanted books on budgeting for teens.  Fair enough.
I started to search for the elusive subject heading that I knew would be there, but with a certain type of patron, a full minute of searching - let alone 3 minutes of searching - is just too much, and obviously I don't know what I'm doing.  She started to give me suggestions, and show her impatience fairly quickly - I'm sure we've all experienced this phenomenon.
Because she was so impatient, I suggested that she use some of the general budgeting books I was finding.  She replied that those wouldn't work, because - wait for it - "With teens, sometimes you have to dumb-i-fy it."
Now, usually, I slip into my poker face and try not to comment on the patron's statement.  But this time - with this shaper of young minds - I just couldn't resist.
"Um...," I said, "Did you... just.. say... 'dumb-i-fy'...??"
"Yeah," she nodded pertly, "Sometimes they just don't get it."
At this point in our conversation, two things happened together.  We suddenly got very busy on the Desk, and I snagged the perfect subject heading as I knew I would.  Since she's a teacher (heh), I wrote it down for her and sent her to the catalogue computers to find materials, and told her I'd check back with her in a few minutes.  It should be pretty easy - right? - to find books with the perfect subject heading put in your hand for you?
But when I got back to her five minutes later, the only thing she had found of value was a 1986 children's book at a different branch.  Puzzling?  Oh.  The despair.  Indeed, she was using my perfect subject heading in a TITLE search.  Yup, a high school teacher who doesn't know the difference between a subject search and a title search.  And I couldn't talk her into doing it again correctly.  She was all used up.  She insisted that she'd drive all the way to Branch X to get her outdated budget book for kinders, and make the best of it.
It bugs me that she's dumb and doesn't know it.  It bugs me that she probably thinks I wasn't very helpful because I didn't put the best books in her hand in the 30 seconds that she afforded me.  It bugs me that her students have to put up with her for a whole year.  And mostly, it bugs me that she has such little respect for the potential of her bet-they're-wildly-smarter-than-her kids.
Sayonara, Ms. FancyPants.  May your teens dance circles around you.