Little guy comes into the library; he needs help finding a book on lions. He holds the scrap of paper with the call number we found; I guide him over and leave him to pick something.
He comes back with that book, and now wants something on JFK (he says it like that: in initials). We search for those items and I again leave him to pick something. He sits down on a KikStep and starts humming "Hail to the Chief." Which is now stuck in my head.