I've read a pyscological paper (a similar idea was used on a comedy TV show) about how people will behave when meeting someone wearing a hi-vis yellow jacket - they tend to obey the order despite how silly it is  - because we're conditoned that someone wearing a unifom is in charge.

But I wouldn't expect this from a bunch of people because someone is holding a camera. Normally when shooting things like CND demos, anyone from the press, it's the opposite reaction.   

Pinky - you left the lens cap of your mind on again.