a figure of speech in which a similarity between two things is highlighted by using a word to refer to something that it does not literally denote — as when Shakespeare wrote, "All the world's a stage."
When Shakespeare wrote, "All the world's a stage, And all the men and women merely players." he was not saying the world is really a stage and all people are actors. But he was pointing to the similarities he wants us to recognize.
Don't ask me where these people find their metaphors, I don't know.'
Chapter 30 (7% in)
There are no more uses of "metaphor" in The Bourne Supremacy.