Suddenly the train goes through a tunnel.
It is completely dark.
Then is heard a loud kiss and an equally powerful slap.
When the train exits the tunnel, the Russian soldier is holding the side of his face, and the Czech dissident is grinning his face off.
The old matronly woman thinks : "Now that's a fine young woman, the Russian soldier tries to steal a kiss in the tunnel and the lady slaps him one!"
The young woman is thinking : "Now that's a strange Russian soldier, he'd rather kiss that old hag than me."
The Russian soldier is thinking : "Now that's a smart Czech, he steals the kiss and I get slapped."
And the Czech dissident is thinking : "Gee I'm smart! We go through the tunnel, I kiss the back of my hand and get away with slapping a Russian soldier."