What are the top 20 strangest addictions?

Some of the strangest addictions include compulsive eating of non-food items (pica), addiction to the sensation of being tickled, and a fixation with collecting unusual items like toenail clippings or used tissues. Other peculiar addictions feature a need for extreme body modifications, such as implants or tattoos, and an obsession with specific online games or virtual realities. Additionally, some individuals may develop a compulsive behavior towards activities like extreme ironing or competitive duck herding. These unique addictions highlight the diverse ways human behavior can manifest.