I'm reading "How Would You Move Mount Fuji?" by William Poundstone. It's about Microsoft's unique brand of puzzle like questions they use during job interviews - the title of the book being one of them. I'm not too far into it, so I haven't got to the answer about how to move Fuji. But Poundstone seems to claim that Microsoft interviewers don't necessarily look for the right answer so much as how you attack the problem and your process for reasoning it out.
I know what I would say if an interviewer asked me how to move Mt. Fuji. I would say "Be more specific. Your question isn't clear. Mt. Fuji is already moving." Right? Mt. Fuji sits on earth, which is rotating on it's axis, and is also hurtling through space about the sun. I'll read this book and see what Microsoft wanted in the answer.