Two men were talking one day and one mentioned he was visiting Russia.
The friend tells him that it's politically rough over there and that they check letters leaving the country for dissenters. So, he instructs the man to use a code- write in black ink if everything is fine and red ink if things are bad.
The man goes to Russia. A couple weeks later the friend gets a letter in black ink. It says all sorts of positive things about Russia- how rich it is and how nice the people are to him. "My only complaint," he writes, "is that they don't have red pens."