When British actor Donald Pleasance was cast in the rΓ΄le of Blythe the Forger in the 1963 film "The Great Escape", he already had prepared for the part 19 years earlier when, as a bomber crewman in the Royal Air Force, he was shot down, captured, and imprisoned as a POW by the Germans in Stalag Luft I.
The set built for the film was so realistic, Pleasance later said that "It was an exact reproduction of a prisoner of war camp, and just as frightening."
Photo of Pleasance on the left is from
raf166squadron.com; photo on the right is from the film