Spoiler Alert!

[Zigûr]

I'm fairly sure that when I first read The Lord of the Rings (at age 10, far too young to truly appreciate it) the manner in which the Ring itself is destroyed (ie Gollum seizing it and falling in) was spoiled for me, but I think I was too young to appreciate that something significant had been given away.

I've never been that fussed about "spoilers", however. I'm very much a re-reader and re-watcher, and I feel that often a text takes multiple readings/viewings to be fully appreciated, so I'm not especially concerned about knowing what happens in a narrative as long as it happens in an interesting or impressive way.

When I watched the "Hobbit" films, I deliberately spoiled them for myself so that the changes from the book would be less frustrating.