I just rzhu with the English sense of humor.
Now watch a film about the British intelligence during the Second World War. They intercepted the letters of different high-ranking military and civilian officials of the German, gently read and send further. Correspondence one official did not contain anything important. But the one who handles his mail, noticed that the object of observation at the same time wrote two women - his wife and his mistress. And just for the banter letters changed places.