I love any moment where Sam sings. The best is when they are near Weathertop in FotR, and one of the hobbits asks about Gil-Galad. Just recently I was reading that part and I came upon the poem. I don't have the book with me now but it goes something like this: "A low voice started chanting..." I immediately (in my mind) read the poem as if Aragorn was saying it, and I was as surprised as all the characters to find out that Sam was the one singing. Also the fact that he only remembered the part about elves and not the part about Mordor is funny. It just shows what a good-natured hobbit Sam really is