This is an easier answer because you don't have to show off your strength here. All you have to do is make sure you don't pick a subject that relates to your job. It is also safer to pick something that most people do not enjoy. Finally, picking something that you are not good at is acceptable if it is not a skill required on the job. My long example will be about a drama class.
You are putting yourself down a lot here, but in this example it is actually good. Interviewers are worried that a person who can act well will be able to lie about many things during the interview. A person without acting skills will not be able to hide automatic body gestures that the interviewer is looking at. Also, this answer is good because it shows that this person never gives up and puts in a lot of effort.
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