I got asked that once in an interview. Here was my canned response to this management question and others like it.
"In my experience, there's only one thing that will motivate an apathetic individual. That one thing is trauma. As biological organisms, we behave in biological ways. One of the characteristics common to biological organisms is that we all respond to stimuli. There isn't necessarily one stimulus that is responsible for motivating an individual... it's a collection of things. But some people -- the "apathetic" people -- have built up a tolerance for stimuli such that they are "dead" to most common means of motivation. I am not an apathetic person, and hence am able to respond to both positive and negative means of motivation. I don't feel a need to build walls to shelter me from experiencing life. Thus, I respond to pretty much every possible means of motivation excepting, of course, unethical and illegal means. You did bring chocolate to this interview, didn't you?"
I got the job.
"In my experience, there's only one thing that will motivate an apathetic individual. That one thing is trauma. As biological organisms, we behave in biological ways. One of the characteristics common to biological organisms is that we all respond to stimuli. There isn't necessarily one stimulus that is responsible for motivating an individual... it's a collection of things. But some people -- the "apathetic" people -- have built up a tolerance for stimuli such that they are "dead" to most common means of motivation. I am not an apathetic person, and hence am able to respond to both positive and negative means of motivation. I don't feel a need to build walls to shelter me from experiencing life. Thus, I respond to pretty much every possible means of motivation excepting, of course, unethical and illegal means. You did bring chocolate to this interview, didn't you?"
I got the job.