Back in the days of communism, a teacher from the GDR got a job in Siberia.
Knowing that the mail would be heavily censored he established a code with his friends: “If I write in BLUE ink, you’ll know everything I say is true. But if I write in RED ink, you’ll know it’s all lies.”

After about a month, his friends received the first letter, written in BLUE ink:
“Everything is wonderful here! Shops are full. There’s an abundance of great food. Apartments are large, comfortable, and well heated. Theaters show recent movies from the West. There are many beautiful women ready for an affair... The only thing missing is RED INK.”