At a previous job, we were interviewing people, and my manager at the time came up with some interview question and would fail people who didn't get it. I don't

At a previous job, we were interviewing people, and my manager at the time came up with some interview question and would fail people who didn't get it. I don't remember what it was exactly. You would go through some data multiple times, and calculate some answer. If you were somewhat clever, you could do it in two passes. But there was a trick, where you could do it one. About half the people tested could do it in two passes. I never saw someone do it one. I told my manager his criteria was bullshit and he should stop expecting a one pass solution for a passing mark. Of course, he got all up in arms and said I was stupid for saying that. We grabbed another person on the team, and him do the question. He got a 2-pass solution, and couldn't see the 1-pass solution. So my manager started to explain it, and his explanation was going nowhere. Eventually, we got the entire team around looking at a whiteboard listening to him to try explain this 1-pass solution. Fifteen minutes and seven engineers later, he succeeded, and unironically declared, "I told you it was simple."