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The Good Soldier Svejk by Jaroslav Hasek.
Written ca. 1920. Very funny and sarcastic story about Svejk, a Czech everyman, who has to enter the Austro-Hungarian armed forces in the first world war. He's 100% honest, content and happy in every situation, and always tries to do what he thinks is the right thing. This causes all sorts of problems in the paranoid, rule-driven society he lives in, and even more trouble when he's in the army. A beautiful way of ridiculing the absurdities of war and bureaucracy. And religion. And people with power.
The author, Jaroslav Hasek, is incredibly interesting. Many of the hilarious events in the book are taken directly from his own life, like the time he became editor for a magazine about animals and got fired because most of the articles he wrote were of animals he'd invented himself. Or the time he acted insane and got locked up, just so that he could spend some time in an asylum to see what it was like.