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Morecambe and Wise, the famous team of Northern comedians, used to complain about the propensity of Yorkshire audiences to “zip their teeth up,” as they put it. Eric Morecambe claimed one man in Leeds said to him, “Ee, lad, thou wert so funny tonight I almost had to laff.
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Paul Johnson (Humorists: From Hogarth to Noel Coward – Captivating Biographical Portraits of the Western World's Greatest Wits)