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Laughter, n. An interior convulsion, producing a distortion of the features and accompanied by inarticulate noises. It is infectious and, though intermittent, incurable.

Ambrose Bierce (1958). “The Devil's Dictionary: A Selection of the Bitter Definitions of Ambrose Bierce”, p.100, Prabhat Prakashan
Laughter, n. An interior convulsion, producing a distortion of the features and accompanied by inarticulate noises. It is infectious and, though intermittent, incurable.