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The Joke (Zert)

The scientist Ludvík Jahn returns to his hometown after two decades away. He is interviewed by Helena, an attractive older woman whom he begins to seduce. Jahn then discovers Helena is married to Pavel, an old rival.

Jahn flashes back to his college days and his love for Markéta, a devout believer in communism. In an attempt to make the humorless Markéta lighten up, Jahn sends her a postcard reading "Optimism is the opium of mankind. A 'healthy spirit' stinks of stupidity. Long live Trotsky! Yours, Ludvík". Markéta turns the postcard over to the Party, however, and Jahn is brought before a Party hearing to answer for his words. Pavel, a friend who had pledged to help him, calls in the meeting for Jahn's expulsion from the college and the Communist Party, and Markéta joins the vote against him.

Jahn then undergoes six years of "reeducation", which are split between prison and army service in a technical auxiliary battalion under a sadistic drill sergeant. While in the army, Alexej, a true believer in communism, appeals to higher authorities against their treatment; when the man is consequently expelled from the Party, he commits suicide.

In the present, Jahn successfully seduces Helena, motivated more by a desire for revenge on Pavel than attraction to her. Though Helena falls in love with him, he discovers that she and Pavel have long been estranged, and Pavel has a new lover of his own. The only person hurt by Jahn's attempt at revenge is Helena.