The DDR’s educational system apparently was not perfect:
A high-school teacher asks his class: “Who wrote the Communist Manifesto?”
“Not I, not I, I didn’t do it,” all the pupils respond quickly.
Aggravated at how little of Marxism-Leninism they know, he tells the story at home to his wife that evening, and she says, “I don’t know why you’re so upset, maybe it really wasn’t any of them.”
Now really upset, the teacher storms out of the house and goes down to the neighborhood bar for a drink. He meets a stranger and tells him the story.
“Don’t worry,” says the stranger, “I’m from the Stasi. Don’t worry, we’ll get to the bottom of it, we’ll find out quickly enough who wrote it!”
Source: Marcuse, Peter. Missing Marx: A Personal and Political Journal of a Year in East Germany, 1989 – 1990 (New York: Monthly Review Press, 1991)