He shrugs. "Truck driver could be ruled out by other circumstances dictating that he stay in one place. I'm sure I could come up with similar excuses to rule out any other career you could name, but I'm less sure I want to bother. If we run across a double of you who is pursuing an ignoble career due to circumstances outside his control, I will happily announce that I told you so. If we run into one who is just plain dull, you may freely taunt me in return."