There's the entertaining bit in the film The Imitation Game (the breaking of Enigma code by Alan Turing) where they realised that a weakness was the daily weather report always containing the words "weatherreport" and "heil bloody hitler" (with obvious addition!)
https://www.youtube.com/shorts/fAsSNjedZWI or longer version: https://www.youtube.com/watch?v=SkETN-xENAM