Ten of the best riddles in literature

At the Guardian, John Mullan named ten of the best riddles in literature.One entry on the list:The Hobbit, by JRR TolkienBilbo has to defeat Gollum in a riddle competition if he is to escape from the tunnel under the Misty Mountains. Here is his first one. "Thirty white horses on a red hill, / First they champ, / Then they stamp, / Then they stand still." Answer: teeth. Gollum's reply? "Voiceless