Manalive (1912) is a book by G. K. Chesterton detailing a popular theme both in his own philosophy, and in Christianity, of the 'holy fool', such as in Dostoevsky's The Idiot and Cervantes' Don Quixote.
The book was first adapted in 1973, in French, as a Belgian film named Le revolver aux cheveux rouges.
A 2012 American motion picture was produced by Dale Ahlquist, president of the American Chesterton Society, with screenwriter, producer and director Joey Odendahl. The film starred Mark P. Shea as Innocent Smith and Kevin O'Brian as Professor Eames. A private screening of the movie was shown at the American Chesterton Society's 31st Annual Chesterton Conference in Reno, NV on August 3, 2012.