It is easy to laugh about this old candid camera ‘prank’ - but it is a very good study of our social behavior and conformity. We want to fit in - and most of us do it automatically and without ‘thinking about it’.

So next time you stand in a cue, shop in a mail, go into an elevator or sit in a sauna - try to see what kind of rules are in play, what kind of consensus is silently agreed on and how you yourself comply.