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Laughter is equally the expression of extreme anguish and horror as of joy: as there are tears of sorrow and tears of joy, so is there a laugh of terror and a laugh of merriment.

Samuel Taylor Coleridge (1858). “The complete works of Samuel Taylor Coleridge: With an introductory essay upon his philosophical and theological opinions”, p.156
Laughter is equally the expression of extreme anguish and horror as of joy: as there are tears of sorrow and tears of joy, so is there a laugh of terror and a laugh of merriment.