i hate those questions!
i always put something like:-
i need a new challenge and this looks quite technical and i would like to improve my skills in this area.
that sort of thing. CV style bullshit! i always think they don't read what you write they just want to know that you can actually string a sentence together that sounds sensible. preferably with no spelling and grammer mistakes, for CV's i always get the dictionary out coz i know my spelling can be crap.
in my last interview it was quite obvious i was there for the money, the interviewer knew it and asked why i applied, i said "being honest this is not what i want to do but i have hit a point where if i don't make a jump in career and money i will never beable to afford my own house, i work hard and can be trained and you will be happy with my performance"
he pretty much said on the spot when can you start?
You have enemies? Good. That means you've stood up for something in your life.