This is less of a question and more of an interviewing technique. This has been the best method I've used to find hustlers. Whenever I am interviewing someone, I like to bounce all over the map and try to find a personal topic they are really passionate about — whether it’s ABC, skiing, or a particular author they love. When you find something (this can be anything), you’ll be able to hear it in their voice and see it in their body language. That can serve as your control for when you start asking the job specific-questions, making it easier to tell if they are truly passionate about the role you’re looking to hire them for.