The job I have right now is my dream job, and I found out later, even through several rounds of grueling interviews, that what got me the job was the very first question of the very first interview. My now boss asked me what my dream job would be like. I answered: "If you would have asked me that 20 years ago my answer would have been different - I might have talked about a big office, perks, etc., but as you move along in your career you get over the personal rewards pretty quickly, and understand that the real personal career gratification comes in making a contribution to an organization, when people look at you and depend on you for your expertise." Sounds like bullshit, but I really believed it, and it got me the job.
Actually, I'm willing to bet that's what got you the job. A good interview has an amazingly keen bullshit detector.