1970's
US has succesfully trained a spy for Sovien Union area - in five years he has taken all possible courses in language, culture, history, dialects, politics etc.
Finally he parachuted into Siberia coming to the small hut at the edge of tiny village. He knocks on the door, a granny answers:
- go to hell, you american spy!
- what, what are you talking about, I am a tourist, picking up mushrooms...
- baldrocks, you are an american spy, I won't let you in!
- I'm not!
- I'll go and get milice then
etc, etc for half an hour.
Finally the guy breaks down:
- OK, I am an american spy, how did you know?
- Well, boy, there are not so many black guys here in Siberia