Guy calls looking for book. This conversation ensues.
me: Where would I look for it, is it fiction?
guy: Yeah, fiction. *long pause* Or, like, nonfiction? History?
me: Uh. *opens browser and checks Amazon*
Of all the goofy stuff people say, the intractable difficulty of determining the difference between 'fiction' and EVERY OTHER TYPE OF BOOK is the one that drives me craziest.