No (half decent) interviewer wants to trip you up, or catch you out. If they haven't given you any details, then you probably don't need them. Yes, you may have to teach a (little bit of a) lesson. Or you may have to just plan it. Or talk about how you would plan it. Or mark some work. Or have a group discussion about so-and-so. They want to see what the real you can do - so get a good night's sleep and do your best!