The Great Automatic Grammatizator (published in the U.S. as The Umbrella Man and Other Stories) is a collection of thirteen short stories written by Roald Dahl. The stories were selected for teenagers from Dahl's adult works and published in 1998. 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.