Interviewers are not looking for canned or premeditated answers to these sorts of questions, they want to see if they can sort out what kind of person you are in a 15 minute interview and if you seem like their sort of coworker or not. They know what sort of person they are looking for usually. I am not sure if this approach really works or not, some psychologist might know better, but at any rate your candid response would be in the best interest of both parties. They need to see who you are, and you really should not be hiding who you are either as it will eventually come out at work. I have always been pretty frank at interviews, and I consider it one of my better skills. I might glance at a list of questions like this just so I am not taken unaware of what might come up, but I certainly never memorize a response, I just conceive how I want to come across, then speak my mind. They know you are only human, and there are usually no wrong answers to these kinds of questions.