The Luck of the Irish?

During World War II, the captured Allied agents of Stalag 15 were attempting yet another daring prison break. Prisoners Major O’Roarke and Lieutenant Flanagan had planned for months to acquire two steel files and now finally possessed them! On this particular night, they had chosen to try to cut their way through the bars of the East gate. Stealthily they slithered to the gate with perfect timing so the guard was not near. They were hard at work when the siren sounded, and the floodlights caught them in the act. As the German officer led them away, O’Roarke said, “We were so careful. How did you ever catch us?”

The German replied, “Unfortunately for you, but I can always tell when Irish spies are filing.”