A butterfly flaps its wings, and it starts to rain. It's a scary thought but it's also kind of wonderful. All these little parts of the machine constantly working, making sure that you end up exactly where you're supposed to be, exactly when you're supposed to be there. The right place at the right time. Because somehow I ended up at the right place at the right time. And as a result, my life would never be the same. 

- How I Met Your Mother (2005)