I set it up so that they couldn't really bust me out on anything. If you emphasized on how adaptable you are, I don't think they should give you any trouble. However, if they do. Don't get angry. I planned that if they asked me about being black and racism in Japan....I would spin it into "it can't be helped because limited exposure" combo'd with "that's part of the reason I want to work in Japan is to show them the real thing, show them me....yada yada." You just gotta be positive like Martin Luther King and not get butt hurt. They do that on purpose to simulate the real thing.
As for the tough guys, I believe Toure got one. The most he asked him was "You're a business major, you could get a job working in a business in Tokyo. Why be an English teacher?" Luckily, you're not a Business major, so I doubt they will ask you anything that will catch you off guard....because I think the JET program is geared towards HRS majors. lol'd I was only asked like 4 or 5 questions. That's how well I elaborated XD