A dirty joke is not, of course, a serious attack upon morality, but it is a sort of mental rebellion, a momentary wish that things were otherwise. So also with all other jokes, which always centre round cowardice, laziness, dishonesty or some other quality which society cannot afford to encourage.
George Orwell (1903-1950) English journalist, essayist, writer [pseud. of Eric Arthur Blair]
Essay (1941-09), “The Art of Donald McGill,” Horizon Magazine
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