Issue a discount catalogue - or DO THIS instead

This happened in a supermarket (John Lewis Foodhall, London.). That is not new. That it happened  is not new. But look carefully at: 

(a) the number of p[hones the crowd produce and

(b) read the comments on the original YouTube

... and consider that I am writing about here and that the original link was forwarded to me via email. 

THAT is the power of the network.