As summed up in one Sunday afternoon shift.
6th grade girl: Do you have any Terry Pratchett Books? What other fantasy and science fiction books to you have? I love reading! Books are awesome, etc.
Me: You know, you should check out our Teen Summer Reading Program. All you have to do is write one book review, and you get a free book!
6th grade girl: Um, no. No way man. No thanks. See ya.
5th (?) grade boy: Do you have any manga?
Me: Yes! Yes we do. It is right over here.
5th grade boy (seeing the manga collection): Oh man. Oh my gosh. I HAVE HIT THE JACKPOT!!!
Updated to add: And then right after that, an older patron came to the desk asking for a book (which apparently doesn't exist). While I was looking it up, she let go with the longest, loudest, breeziest fart I have ever heard. It was truly impressive.