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Continue to ChatLaughter would appear to be a physical reflex, although even if it is, this still leaves unanswered the question of why the human response to humor is a convulsive spasm of the respiratory mechanism rather than a crossing of the eyes or a waving of the arms. - Steve Allen from https://whatsmyquote.com/quote/laughter-would-appear-to-be-a-physical-reflex-although-even-if-it-is-this-still-leaves-unanswered-the-question