This goes out to all you Yanks...?

We Brits get a lot of your TV shows and movies over here (which, by the way is a good thing as most of our movies and TV shows are lame). So clear up the following - why do you Americans call their fathers 'Sir?' Why does Cleveland seem to be a national joke? And Sears, for that matter? Is George W. Bush really as dumb as we think he is? And if you have any 'Brit' questions, fire away.