"if you were writing an exam and noticed somebody obviously cheating, what would you do?"
one of my close friends who is now in med school was asked that during his interview and said it really rattled him because he took the high road saying how he would obvious tell on that person because it's unfair for them to potentially get good grades for something they didn't do. the panel flipped that shit around on him and said "well what if it was a single mother with several children who desperately needs to do well to get a certain job so she can provide for her family, do you still feel committed to your moral obligation to be a rat?" and my friend was all stumped and saying shit like "well in that case i guess it's more acceptable, bla blaa" and the panel again said "so you're changing your mind? we dont want you to assume anything about who the person is, we want a general statement as to how you would react given no prior information about the person, because you really dont know the situation theyre in..", so yeah they totally drilled with that.
in retrospect, he was saying that they were looking more for an answer like "well i would talk to the person afterward, say that i noticed and didn't appreciate them cheating and if i see it happen again i'll be forced to take further action" because with a response like that you aren't taking either extreme and condemning or condoning, but you are bringing it to the person's attention and leaving it up to them whether or not you will deal with it more severely.
in really serious interviews people will do that shit to you, and try to rattle you. give you a tough question and then when you answer say "ok well what about in this case, would you do the same thing?" and they do not like seeing you change your mind and acting indecisive.
whatever you do, don't assume anything, and try to take a moral highground without being too stuck up, if you know what i mean. be firm, concise, have a strong opinion, but dont be a fucking douche about it, like my friend with his "well i'd tell on a cheater no doubt" style of remark. be confident and stand by your decision, but make sure you have all your bases covered so no "what if's" can be thrown at you..
another couple of good questions people will have and see where you go with it are "what are your goals in life, short term or long term" and "describe yourself using one word". shit like this you should know before hand, as they dont want to see you thinking about shit that you should know. you should know yourself, and you should know what your goals are and have ambitions, you know? if these kind of questions leave you stumped, that's a bad sign to them.
food for thought, any way