I have sometimes asked the hiring manager to describe when and why he gave a report a negative review about something. This usually causes a long pause.
It isn't at the end, but a few times I've asked mid-interview for one of the team members to give me feedback as though it were for a peer review.
I've been known to ask what an interviewer's favorite NPR show is. It's great if the interview is at a location I'd have to relocate to and they answer with a show carried locally I've never heard. That's how I learned about "Says You" (which is the correct answer to my question, with points for effort if it's "Wait, Wait Don't Tell Me" or "Prairie Home Companion").
It isn't at the end, but a few times I've asked mid-interview for one of the team members to give me feedback as though it were for a peer review.
I've been known to ask what an interviewer's favorite NPR show is. It's great if the interview is at a location I'd have to relocate to and they answer with a show carried locally I've never heard. That's how I learned about "Says You" (which is the correct answer to my question, with points for effort if it's "Wait, Wait Don't Tell Me" or "Prairie Home Companion").