I took my best friend with me to see The Return of the King for my second time. She has never read the books, but did watch the first two films.
It wasn't that bad really, except she kept saying things like, "Does he die? He dies right?" or (referring to Aragorn), "He's so pretty!"
Oh, and I forgot to mention the fact that when I was almost crying at the point when Sam is holding and talking to Frodo outside of Mount Doom, she's laughing.