Do you own a gun?
My answer is always: No, I don't have a gun, and have never fired a gun. Yes, I know many people back home who have guns. Yes, I have also heard that (New York, Chicago, Los Angeles, Detroit...) is a very dangerous city.
Why they ask it: I suppose it's a reasonable thing to ask an American, because so many American households own a gun. The gun debate in the United States is often presented as a 50/50 argument, but it's the only developed country in the world where that is so.
Related Questions: Have you been shot before? Do a lot of people in your city have guns? Do a lot of [insensitive stereotype] people have guns?
Is America really like in the movies?
My answer is always: Yes, my high school really did have lockers. Yes, fraternities and sororities do exist. No, my high school was not run by an evil gang of cheerleaders. No, no one can afford to live in an apartment like in "Friends", unless they're really rich.
Why they ask it: Much of what people know about the United States comes from movies and TV shows; if all your only point of reference about college were Van Wilder, you'd think anyone could stay in college for seven years and still score prime-era Tara Reid.
But the same goes for the average American's understanding of the rest of the world. Australia is filled with guys like Crocodile Dundee, right?
Related Questions: Have you been to Hollywood? What's it like to have famous people come from your country? Is prom real, or is that only in "Gossip Girl"?