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As with the previous season's "Twitching for UNICEF," this Bewitched episode is a half-hour endorsement for the United Nations Children's Fund. Not wishing to see her "national holiday" exploited, Endora refuses to allow Samantha and Tabitha to go trick-or-treating on behalf of UNICEF. When Sam defies her, Endora retaliates by transforming Darrin into a hideous Halloween witch. By episode's end, however, Endora is won over to the UNICEF cause -- and so, presumably, is the viewer. Written by Shirley Gordon, "To Trick or Treat or Not to Trick or Treat" first aired, appropriately enough, on October 30, 1969.