One of my "must see" viewings every Halloween is "Trick or Treat", a Donald Duck short featuring Donald, his nephews, and a friendly old hag named Witch Hazel. This song is fun and catchy. I can hardly ever say the phrase "trick or treat" without hearing this song in my head!
We had a great comic book story version of this for years before ever seeing the cartoon, and the phrase "Whiskers from ye billy goat!" was much quoted from it.