A man who was tired of his neighbors constantly using his pool without permission decided to come up with an unexpected revenge plan. Instead of confronting them directly, he secretly added a chemical to the pool that turned the water a bright, fluorescent color. When the neighbors went for a swim, they were shocked and embarrassed by the strange hue of the water. The man’s revenge not only put an end to their unauthorized pool usage, but also left them with a colorful reminder of their boundary-crossing behavior.