It's something that's gained notoriety on the web in the past several years; someone organizes a "flash mob" to meet up at a certain time and place and impress a crowd of onlookers with their random outburst of dancing and/or singing. They're all the rage these days, and it seems like there's a new one every week.
But I think we have a thing or two to learn from the Russians, who put on a hell of a show during their flash mobs. They don't phone anything in, that's for sure; incorporating Taco's '80s hit "Puttin' On The Ritz" with choreographed sweepers, professional-looking backflips, and a newly married couple in the snow, this group knows what the hell they're doing.
The original song: