Irrelevant and sometimes technically incorrect questions asked repeatedly or asking a question again that you failed to answer to their satisfaction. I only had

Irrelevant and sometimes technically incorrect questions asked repeatedly or asking a question again that you failed to answer to their satisfaction. I only had it happen to me once in what was meant to be the non-technical interview part of a long interview process by a clueless CTO. In the previous technical section of the interview he had asked a very strange question regarding a solution I had presented and was corrected by a member of his own dev team, I think from that point on he took a dislike to me.