Group think is old news. As a reminder this can be used for good, bad, and your benefit. Old video from years ago proves this point:
What is not shared is how many different people (or takes) did it take to get people to follow along? What percentage of people who entered the elevator reacted in lock step fashion? I would guess a high percentage of 70% or so.
What percentage of people questioned others in the elevator? If given a response which ones then acted in lock step?
What things are you doing that make people (a group, a tribe) face a different way in the elevator?