Day in the Life of an Idiot

OMG IRON MAN! I saw that last weekend and it was SO excellent! I think it's the best superhero movie since Spiderman 2, in terms of pacing, character development, and kickass-but-fitting special effects. And I agree that Robert Downey Jr. essentially WAS Tony Stark. I'm trying to convince my parents to see it in the theatre so I have a chance to go again. SO AWESOME!
As for your other question, I am not current at all on comics (right now I'm focusing on reading Silver Age stuff), but I think we all have a visceral fear that Things Are Not As They Seem. I think there's a psychological term for believing people you know have been replaced by robots/clones/whatever. (One quick Google search later, there is: Capgras' Syndrome or Capgras' Delusion.) As I said, I don't know the details of the situation in the comics, but I think we all have a quiet desperation that things stay the way they are, and when that doesn't happen, it can bother us, especially if it appears we've been fooled for some time. Humans don't like being fooled.
Or that's all Vicodin-induced crap, I don't know. I just had surgery yesterday. All I do know is, IRON MAN WOO!