Concept

Inebriated, housing challenged man of indeterminate age walks up with a reference question. " I want a book on concept."
Me: "Concept of what?"
He: "Concept--you know--concept."
Me: (not wanting to appear stupid): "I understand. Concepts are ideas. So what do you want the concept to be of."
He: (clearly getting frustrated and weaving) "You know, just concept."
Me: (trying to placate) "Okay, let me see what I can find"
I search the fantastic catalog for the keyword, "concept".
Me: "Sir, just as I thought when I search for concept, many books come up, but they are all about the concept of something--cars, airplanes, shapes, etc.--not just a book on concept. Tell me more about what you are looking for." (And for the love of God, step back at least 6 feet so I don't have to smell you.)
He: Okay, try delusion. The delusion of concept. The concept of delusion.
Me: Huh. Okay....... Yep. Not finding anything on that either. Keep talking.
He: You know --self concept and delusion.
Me: (thinking general psychology might fit the bill), well let's walk over to this section and you can look and see if these answer your questions.
Together we gaily walk through the stacks acknowledging our delusions--me that I can answer his questions. He is deluded to think there is a book on concept.
Me: Lookeee here--some books that might have the answers.
He: (Seeing the "self help" marker) Oh no. I don't want self help. I want concept. I want books on concept.
Me: Again, sir. I can't locate books just on concept or idea. If there is a subject you want, I'm happy to help you find it.
He: Oh I get it. These here books are arranged by subject.
Me: yes.
He: I want the subject of concept.
Me: (Oh hell no-no-no-no) I'll leave you to look through these and if they don't answer your questions, you can come find me (I'll be hiding on another dimension) and we'll keep looking.
I step back onto the pathway to the desk. He follows and yells behind me, "Concept. I just want a book on concept."

Yeah, good luck with that.