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Bob becomes more neurotic than usual when he discovers that Emily's IQ is 22 points higher than his. As if that wasn't embarrassing enough, Emily is invited to join a MENSA-type club, while Bob is left out. The supporting cast includes: frequent Bob Newhart Show writers Tom Patchett and Jay Tarses, respectively cast as David Robbins and a waiter; Newhart's real-life father-in-law Bill Quinn as Ralph Hodiak; Claudette Nevins as the hostess; and Perry Castellano as a boy genius. Originally shown on November 3, 1973, "Mister Emily Hartley" was written by Charlotte Brown.