I've seen some bizarre customers over the years, but I've only met one owner that even comes close.
We were out with another couple. I ordered a veal chop and it came out literally frozen solid. You know I'm all for rare, if not raw, meat, but come on, I have to be able to at least cut it, right? The waiter actually argued with me a little when I wanted to send it back.
I was a little worried about what they might do to it, so I didn't eat the replacement. I wasn't going to say anything, but the couple we were with had something wrong too, and the lady wanted to see the owner. When he came out, she got about six words out before he told her to be quiet, and this is a direct quote as best I can remember - he told her: "you listen to me, I've been in this business for 30 years, and you are just a little girl."