Is that what it's called , a'Flashmob?' Well catspaw, I'm certainly not afraid of my own shadow, and have faced quite a few extremely hairy situations in my very long life. But not everyone can cope with sudden shocks and upsets. Many of my very frail and elderly friends for example would have been terribly upset by such an event happening in front of them in Norwich. If ALL the bystanders were 'extras' (which I find even more bizarre and strange!) then I suppose it did no harm.