Distorted Reindeer
This person kept their lawn decorations on the simple side by placing two white reindeer and nothing else. However, the homeowner displayed the reindeer on their lawn during the day, so they did not realize that its shadows against the house from the street light at night are creating a hilarious shape.
The shadows of the two reindeer look like a Centaur or a mythical creature of a half man half horse. This homeowner was wondering why nobody made a reaction to her home during the day, but everyone would giggle at night. Her house was the popular one in the neighborhood until she noticed and removed them.