I'm a guy who never wanted to hold a steady job, because I was worried about the monotony.
Science fiction, in its purest form, for me, it works the best when it's being used as metaphor to look at something from a one-step-removed process, to give a little objectivity and insight into something that, if you were applying it on the face of it, we'd all be too close to.
I remember somebody asking me in an interview years ago if I would be interested in playing Jason Bourne. I laughed: I didn't think anybody would want to see me run around with a machine gun. It always stayed in the back of my head that I had reacted like that. It bothered me.
A cameo in 'Doctor Who' would be kind of cool to have on my filmography.