Gekkenbriefje (Alternatively: Crazy Going) is a 1981 Dutch film directed by Olga Madsen. It is based upon the book "Zorg dat je een gekkenbriefje krijgt" by Ger Verrips. It was the first movie that Olga Madsen directed. The film is about a Dutch soldier who does not agree with the Dutch politics surrounding the Indonesian War of Independence.