The Great Automatic Grammatizator (published in the U.S. as The Umbrella Man and Other Stories) is a collection of thirteen short story written by Roald Dahl. The stories were selected for teenagers from Dahl's adult works. All the stories included were published elsewhere originally; their sources are noted below. The stories, with the exception of the war story Katina, possess a deadpan, ironic, bizarre or even macabre sense of humor. They generally end with unexpected plot twists.