On some anime forum or other that I used to belong to, a girl posted a thread intended to be a cautionary tale about posting your original work on the internet. She claimed that when she was in middle school she had written a story about a girl from our world who fell into another world and had to go on a quest to collect jewels, which she had posted on the internet, and she was absolutely certain that the creator of Inu-Yasha had found her story and ripped it off. A number of people pointed out that this was not the most original of plots, but she was convinced, dammit, that no one could have thought of this without stealing it from her.