Okay, no big twist ending, just a personal note: my inspiration for an O. Henry quiz was learning while writing the "Curved Yellow Fruit" quiz that O. Henry coined the term "banana republic". (And being surprised how few people knew O. Henry spent time on the lam in Honduras for bank fraud.) Anyway, the term appeared in a story from his collection Cabbages and Kings, whose title is taken from a line from WHAT POEM?
THE WALRUS AND THE CARPENTER (by Lewis Carroll)