I just got out of a class where we wandered a little bit off topic, but still, I think, in a good direction. There's something really exciting about people realizing, probably for the first time, that not all is equal in the world. Maybe because, for me, that realization was the spark that led to a change in my entire view on the world and how it works. This individual doesn't necessarily get it yet, but the first questions have been asked. "You don't think there's equal opportunity? In my high school the middle class kids went on to prestigious universities and the working- and lower-class kids didn't." These are seen as different choices rather than systematic differences in opportunities.
I don't mean to sound condescending when I say this, I really, really don't... but I find this so exciting! To see someone on the precipice of radically altering their world view by realizing a basic fact about society... this is why I want to teach sociology! It's kind of like (and not at all like) the feeling you get when someone who has never read Harry Potter (or seen the movies) reads it for the first time. If only you could be there when they find out that it's been Quirrell all along, not Snape! If only you could see their reaction when Professor Moody isn't Professor Moody at all and the Triwizard Cup is a portkey. You only get these perspective-altering experiences once, so it's exciting to see and be a part of it when other people suddenly "get it."