Ah, that could be. I don't read much of anything. :-P Mostly non-fiction these days, anyway. But yeah, I expect the motif is present in more than two movies, I just couldn't find any specific examples.
Maybe the motif isn't as common as I thought. Some Googling tells me it was used in The Godfather and Children of Men, but maybe those are the only places? And perhaps not in books at all. Oh well, still interesting irregardless.