What to do when an interview goes off the rails

Thoughts from PR pros.
You’ve landed an interview with a journalist. You’ve prepped your client. You get into the interview … and it all falls apart as the journalist starts asking questions far outside the scope of what the interview was supposed to be.
What do you do?
This is the question I posed on LinkedIn. Dozens of communicators responded, and the answers varied widely from “stop the interview!” to “I’d do nothing” and everything in between.