Wrong quote. The giants were in the book. Some quotes:
> When he peeped out in the lightning-flashes, he saw that across the valley the stone-giants were out and were hurling rocks at one another for a game, and catching them, and tossing them down into the darkness where they smashed among the trees far below, or splintered into little bits with a bang.
> They could hear the giants guffawing and shouting all over the mountainsides.
> "If we don't get blown off or drowned, or struck by lightning, we shall be picked up by some giant and kicked sky-high for a football."
Quote:
> "I must see if I can't find a more or less decent giant to block it up again," said Gandalf
> When he peeped out in the lightning-flashes, he saw that across the valley the stone-giants were out and were hurling rocks at one another for a game, and catching them, and tossing them down into the darkness where they smashed among the trees far below, or splintered into little bits with a bang.
> They could hear the giants guffawing and shouting all over the mountainsides.
> "If we don't get blown off or drowned, or struck by lightning, we shall be picked up by some giant and kicked sky-high for a football." Quote:
> "I must see if I can't find a more or less decent giant to block it up again," said Gandalf