I once thought I had found the perfect candidate for a management position. He answered every question comfortably, confident, and relevant to the questions. I hired him. I found out later he had Asberger’s Syndrome. In his case, he couldn’t interpret or show emotion.
He failed and was terminated. He left detailed information about his job and other jobs he had held in long, letters to himself on his work computer. I took that information and contacted a couple of his previous employers.
He had mastered the interview process. Since they are usually serious and straightforward, they fit his strength. Once variable and emotion were added he failed.
Ever since, I always include a nonsense question to the process in his honor.