Knock (French title: Knock ou le Triomphe de la médecine) is a 1923 French satirical play about modern medicine, written by Jules Romains. It was performed for the first time at the Théâtre des Champs-Élysées in Paris on 15 December 1923 in a production by Louis Jouvet. The play was presented with set designs by a young Orson Welles in Dublin in 1932, translated into and performed in Esperanto the same year, and also broadcast on TV by BBC Television as early as 1938. Source: Wikipedia (en)