We had a couple of stinkers. One interview was irritated to hear he was scheduled on a holiday, tried to cancel and other mixups, then was pretty disinterested in son, knew nothing about him, and then I mentioned one thing and he actually sat up in his chair, ooh, that is very prestigious and actually paid attention to son and asked a few, better questions.
Another school grilled him about why he hadn’t spent weeks at sleep away camp from birth (could be lots of reasons, including dying mother and/or expense) but it went on and on.