Some day I'm actually going to try this in an interview.
Interviewer: "Why do you want to work for us?"
Me: "Honestly, I don't want to work for anybody because I have too much other stuff I'd much rather be doing with my time. But I need an income to sustain myself so, if I'm going to work, I want to work here because I think it'll be easy, provide decent benefits, and it's a 20 minute bike ride from my house."
It might be worth trying when you are already have another solid job in the background :) It could be that you've hit the one company that appreciates honesty, but generally I think most don't love it.