O. Henry was the pen name of American writer William Sydney Porter whose clever use of twist endings in his stories popularized the term O. Henry Ending.   In compilation only.   1) The Last of the Troubadours 2) The Sleuths 3) Witches Loaves 4) The Pride of the Cities 5) Holding Up a Train 6) Ulysses and the Dogman 7) The Champion of the Weather 8) Makes the Whole World Kin 9) At Arms with Morpheus 10) A Ghost of a Chance 11) Jimmy Hayes and Muriel 12) The Door of Unrest 13) The Duplicity of Hargraves 14) Let Me Feel Your Pulse 15) October and June 16) The Church with an Over-Shot-Wheel 17) New York by Camp Fire Light 18) The Adventures of Shamrock Jolnes 19) The Lady Higher Up 20) The Great Coney 21) Law and Order 22) Transformation of Martin Burney 23) The Caliph and the Cad 24) The Diamond at Kali 25) The Day we Celebrate