Started with a few casual phone screens to intro the teams and get an idea of overall experience. Moved on to the technical screen which was very uncomfortable.
My interviewee was very aggressive, at times bordering on angry at answers that were given. At one point he actually yelled into the phone "What you're doing is NOT what I asked". I prompted him to be clearer with his question and he sat silent and simply didn't answer me. At one point I actually considered stopping the interview, asking him to calm down and requesting to be interviewed by someone who wasn't as angry.
Incredibly unprofessional and not expected. Never dealt with this specific issue in 11 years as a DS. There was a moment or two on the call that I was so speechless by the behavior that I actually didn't know how to proceed with continuing.