The film opens with the song "Trick or Treat for Halloween", the lyrics of which tell the film's moral – one must be generous on Halloween or face trouble. One Halloween night, Witch Hazel observes Huey trick-or-treating. When the trio go to their uncle Donald Duck's house, Donald decides to prank the boys. So instead of giving them candy, he intentionally puts firecrackers in their bags, then pulls a string that dumps a bucket of water on their heads. After Donald bids farewell to the boys, the discouraged nephews go and sit on the curb.