So I applied for a school based on it's location, the reputation of the school, and stipend support. There is certainly a lot of fascinating research going on there, but a majority of the topics don't fall in line with my current "interest". I'm using quotes because truthfully I'm interested in the whole field. But I've chosen the area with which I have the most exposure to talk about as my "interest", so it seems more like every career move I made up until now was a highly meditated decision to achieve an ultimate goal. I mentioned my "interests" in the essays I submitted to the school (applications were free, I had nothing to lose), and I got the interview! I'm really excited, but I'm afraid of being asked why I want to go to a school that is mostly involved in subject X when my "interests" lie in subject Y.
Edit: Also, there ARE faculty there whose research interests DO fall in line with my "interests" (I included their names in my statement of purpose).