Yes, when she gave the light to Frodo... I knew that it would be very needed someday! And I can remember still, reading through it when I did not know how it would end, feeling hope... Sam's gift of the seed and soil was, I think, Tolkien's way of telling us, OK... this story is going to get very scary and dark... but they will make it through this and go home again.
And on PJ... there are a few spots where he made things very scary. I still giggle at the woman who was next to me who jumped nearly out of her skin and screamed "NOOOO!" when the Nazgul stabbed the beds at Bree. That was a dirty trick PJ played on the newbies that didn't know the story!
And I was prepped for the Bilbo change. The movie had been out a week when I went (waiting for a chance when my brother and I could go together) so I had already heard all about it here! - There was lots of talk about Bilbo suddenly lunging at Frodo and becoming Gollum-like. So I was ready, gripping my chair, waiting, and I still jumped! hehehe