Last evening I was talking to a friend about how my dad had to learn morse code when he was in the navy, and he related a funny design detection story (not that he put it in those terms).
My friend had a cousin (we’ll call him Bill), and when he was a teenager Bill developed a nervous tapping habit, or so everyone thought. One evening Bill’s family had an older couple over for dinner, and Bill was tapping away when both guests got red in the face and exclaimed “Bill! What are you doing?” It turns out Bill had been learning morse code and tapping on the table for practice. The problem: He was practicing with four letter words, and no one knew until the family invited two retired Western Union operators to dinner!