well from everything ive been told about the HBS interview, it's 1) extremely random and 2) extremely customized to your app. for example, one current student told me that on her interview, they asked her: "so, i see in the past you've lived in city X, Y, and Z. if you could pick one word to describe each city, what would it be?".
im not sure how i would fare in an interview like this. on the one hand, it makes it incredibly easy to prepare for (just know your app inside / out). on the other hand, if you are really nervous and start blabbing about stuff, it could potentially end your app right there on the table (especially if you are to believe sandy from hbsguru).
i figure i might as well get it over with as soon as i can.. my bday will be shortly after the int, and im planning a trip to vegas with my friends. i just hope i dont bomb the int - otherwise it'll be a pretty lousy trip lol