The CIA Spy in Siberia

At the height of the cold war, the CIA tries to infiltrate Mother Russia. Before they send him over, they meticulously train him. The spy spends months in deep linguistic training to learn to speak russian not only fluently but with a legitimate regional accent. They cram him full of all the cultural concepts he needs to know to pass for a real russian.

After months and months of training, they finally send him over by spy plane flying low under the radar in remote Siberia where he parachutes. The spy spends several days tracking through the winter landscape before finally reaching a small village in the middle of nowhere.

By nightfall, he carefully approaches the next little hut and knocks. An old lady opens the door and immediately blurts out "Oh, Amerikanski! Come in, come in, it's freezing out there!"

The spy is nonplussed and replies (in PERFECT russian): "Babushka, why do you say I am american? This is preposterous!"

To which the old lady replies: "Honey (or whatever the russian equivalent is), I've lived in this village for eighty years, and I can assure you we've never had a Black Russian out here!"