That was frickin great! If I saw them I'd yell out "Nice experiment!" to make them laugh! It reminds me of this famous prodigy violinist Joshua Bell who partook an experminent to see if people could notice the difference b/w a street performer and a famous violinst playing 45min in a busy D.C station! Only a few people stopped and listened...and the article noted it was the children who wanted to stay but parents pulled them away (they asked the 'rents outside)
I can't find the longer vids as I don't think the kids being dragged away were in that one...but I saw them before!