If candidates mention a hobby or interest on their resume, ask them about it. Rather than making small talk, you want to see if candidates are well-rounded individuals and get some feeling for their personality. While "likability" should not be your sole factor for determining employment, many roles require some amount of sales ability, and certainly presentation and speaking skills. Hobbies can also tell you about a candidate's risk tolerance, willingness to experience new things, and general outlook on life. Even if the specific hobby in question is an activity you don't enjoy, use the question to check the candidate's ability to articulate and convey passion.