I've always wanted to run one where we bring them to a room to interview. Maybe take a break. Move their stuff to a slightly different room. Pick back up right where we left off. Maybe change out the furniture and people outside during the interview. Introduce them to numerous employees, who will respond to names swapped amongst each other. Another break - switch interviewers. Pick up right where the first one left off - insist that this employee has conducted the entire thing. If they drove there, it would be best to move their car.

I'm not sure what position I would be hiring for, but this is the interview I would like to conduct.

Other possible ideas would be a background check that is either insanely deep (so you're 3rd grade teacher was unavailable for a recommendation) or raises issues that they have no part of, "we see you've spent time in North Korea."