I agree with that "safe" part of the book idea as far as Bombadil goes. Tolkien freaked us out with that whole Black Riders thing, and now is calming us down with some "merry dol, derry dol."
It's a common literary device - look for it in other books. Between exciting parts, there's a break. A love scene is one such break, as is a party.
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If a kid asks where rain comes from, I think a cute thing to tell him is "God is crying." And if he asks why God is crying, another cute thing to tell him is "Probably because of something you did."
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