Years ago, I wrote a historical fiction novel that wasn't very good. However, it sold pretty well and I made a fair amount of money from Amazon. A few years later, there was a mini-series about the same subject and they introduced one of the characters in a way that was nearly identical to the way I wrote it in my novel. Though the character was a real person, the event depicted in my novel and the mini-series never happened. Therefore, I thought it was highly probable that whoever wrote the script read my novel, which was the only historical fiction book on the market about the subject. So, the screenwriter either purloined my idea or it was a huge coincidence.
Has anyone ever stolen your screenplay or script concept? Give the forum dwellers your horror stories.