So many small ways to slip up – it must have been nerve-wracking for spies and even worse for untrained people. The story goes that Gestapo agents were trained to spot escaped American POWs by the way they used their cutlery (if someone switched his fork and knife after cutting his food, he was probably American). Similarly, a Nazi spy was caught in England when he tried to buy a bottle of cider at a pub at 9AM. Then there’s this classic:
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