The symptoms for this is: 5-7 blow up, Reindeer, Santa's, or Snowmen. A Manger scene with 4-6 extra sheep from previous manger scene sets. White, colored or even blue lights on every inch of the house. Plastic Santa's sleighs with Reindeer on the roof. Plastic snowman's, Elf, Santa Faces, etc.
Last week I took Spot for a walk and saw my neighbor squatting on his front lawn moaning, cause he had severe CHRISTMAS DECORATION DIARRHEA!