[a video message left for his son] Tony, you're too young to understand this now, so I thought I would put it on film for you. [gestures to his model of Stark Expo] I built this for you. And someday, you'll realize that it represents a whole lot more than people's inventions. It represents my life's work. This is they key to the future. I'm limited by the technology of my time, but one day you'll figure this out. And when you do, you will change the world. What is, and will always be, my greatest creation…is you.