It was an online technical interview and a technical guy asked me some questions about my current job. After that, he asked me how I can get unique elements from a list but he actually wanted to ask how I can get distinct elements from a list. I firstly misunderstood the question because the recruiter asked the question the wrong way. After I gave my answer he realized the question was wrong and explained actually what he wanted to ask. I think it was not a professional behavior.