It's a personal challenge. Because there are gaps of time between each movie. It's a kind of ageist tryptic: Now I'm this age, and trying to [make] an action movie with the Die Hard theme. How fast can I run? How well can I fight? So that's a challenge and, you know, it's a fun thing to do. If you look at all of them from the first film to the one we just did, there's a story. And you see me age over these films. That has its own interest to me.