I've had it happen in an interview, many years ago. I told him we'd have to agree to disagree. After I was hired, he admitted he looked it up and I was correct (some weird SQL question he asked.)
The best possible outcome.
No, he didn’t want interrupt the interview to start checking out phones.
“I told him we'd have to agree to disagree.”
That’s where I went wrong. But I like to think learned my lesson.