Man: So I've got something for ya. Woman: What? Ya kept it? Man: Of course I kept it. Woman: Why? Man: Because this exact leaf had to grow in that exact way, in that exact place, so that precise wind could tear it from that precise branch and make it fly into this exact face at that exact moment. And, if just one of those tiny little things had never had happened, I'd never have met ya. Which makes this leaf the most important leaf in human history.