Let's focus on the 'cooolest thing' questions as the others are indeed useless in an interview. The whole point of this question is to see if you are excited ab

Let's focus on the 'cooolest thing' questions as the others are indeed useless in an interview. The whole point of this question is to see if you are excited about something you did and if this excitement resonates with the interviewer/the company. At this point you're trying to see if you and the job match in any way. If your excitement doesn't match expectations, then eventually you might not end up happy with the job. By all means, don't answer what your think they want to hear, but what you really find cool.