Was directed to the boss' father for the interview when I arrived (there was no indication that this would happen beforehand). The old man is a patronising know-it-all drunk on his company's success, and his office is filled with photos and books and emails for him to brag about. He even bragged about making his grandson shed tears at his own magnanimity. He was proud of not using computers, saying that they made people stupid - so he got other people to print every email he received so he could read them the old-fashioned way. Because what kind of boss would he be if he wasn't wasteful?
He also enjoyed using abusive language and asking rhetorical questions like "why do you think most of our new employees left after a month?", baiting me into either calling him and his company culture garbage (likely) or asking for more details. I did the latter, and he insulted me for it; he also bashed those ex-new employees, and spoke badly of his own daughter: "I regret sending her to university (because now she won't get married and have children)".
On hindsight, the son probably wanted to entertain the dad so the latter would stop harassing the existing employees for a few hours. If that was his aim, well played.