In the documentary 'Holy F***', Ardal O'Hanlon delves into the colorful vocabulary of the Irish people, examining why swearing is so prevalent in Irish society. The film explores the links between swearing and various aspects of life including science, culture, history, linguistic evolution, religion, and sports. With contributions from notable personalities such as Bob Geldof and Tommy Tiernan, O'Hanlon investigates whether swearing is a sign of intelligence and why the Irish swear so much. This thoughtful and humorous documentary is directed by Gerry Hoban and produced by Loosehorse for RTÉ