Interviewers want to hear that you are a focused, high-performing potential employee. Start off by telling the interviewer that you do not easily get distracted from your work. Next, mention that you realize you are being paid to do a job, and ethically, you feel a need to be working when you are at work. Finally, recognize that you know how to have fun at work from time-to-time taking a moment to celebrate birthdays or get to know your co-workers, and you know how to balance this with ensuring you are getting the job done.