Many years ago, I interviewed somewhere where the HR manager gave me hell. It was a roller coaster emotions. She would say something funny, I would laugh and then she'd take note seriously. Out of the blue, she would ask about my childhood, then switch to why do I look stressed. I had 6 technical interviews before her that went well. I had just lost a family member, talking with her was a nail in my coffin. I was surprised when they called me back.
Two years at the job, a deranged guy accosted us at lunch with my team. He made everyone feel uncomfortable before leaving. Turns out, this was the guy I had replaced. After he was hired he turned into a lunatic who would threaten anyone who questioned his code. The stress test HR made me go through was designed to filter these people out.
I'd like to believe I'm not a psycho since I passed the test, but I don't think it did what it was designed to do. Two of my coworkers are now convicted murderers. One of them with a famous televised trial that just ended last month.