A scary lesser known story of the planning of D-Day.
One of the challenges of D-Day, was keeping the Nazi's fooled. It required a ton of deception, spying, espionage, and code breaking. But one month before the invasion could begin, British Intelligence began fearing security leaks because they found five code words for the invasion in a newspaper crossword puzzle. Overlord, Neptune, Utah, Omaha, and Mulberry.
British agents tracked down the crossword puzzles maker, a schoolteacher named Leonard Dawe, and start interrgating him as if he were a Nazi spy. Dawe became indignant and just asked "Am I not allowed to choose the words I want for a crossword puzzle?" Eventually, the British learned that this was all a coincidence and let him go.
What do you think of this? I for one, find it unnerving. Imagine it, you did something that's relatively common in every day life, or at least you think is common in every day life. But your government starts thinking you're up to no good and bring you in for interrogation because of it.