[Gorwingel]

I actually have read a few books that discuss Tolkien's work, and they talk about how this was a theme throughout many of his writings. I think the main one is Gollum biting off Frodo's finger, because it would have never been distroyed if it was not for Gollum. Also another thing that the book that I read said was that Frodo and Bilbo never really completed their missions. That they were kind of completed by misfortune.