A good case for a class on remedies, it features an unusual harm. “Amy,” a victim of child pornography, is emotionally traumatized when she learns that thousands of people view images of her on the web. Paroline is one of those people, and she seeks restitution from him. It’s not entirely clear to me that he even contributed to the harm, but if he did, determining how much money he should pay her on account of that contribution is a challenge. What is unusual about Amy’s injury is that it requires a large number of contributors but above a threshold additional contributors do not increase the harm. Some thoughts on the case at Slate. There is a good academic paper on the topic, making a similar argument, by Jenna Sheldon-Sherman.