Secret Network of Flash Mobs

Some go half-naked, some are geeky; ABC's John Berman dives into flash mobs.
3:00 | 12/02/11

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Transcript for Secret Network of Flash Mobs
What -- they human -- do when given a powerful new tool allowing us to communicate instantly with large like minded groups. We invented the flash mob that's what we -- genius excuse to act -- -- public we apparently all were waiting for. Of course some mobs are more civilized and other senators John Berman with -- side of the. For better or for worse this is the -- of the flash mob song and dance high -- From a light Saber battle. The -- -- flash -- To the Christmas curious -- and I didn't see you yeah. To the -- -- flash mob hit with subway rides. But the undoubtedly classy -- flash mob on earth. Asked to be the -- even hasn't classy gate because every beat frank -- -- they Colin Guinea after all blown. Inflation. The -- and white. And he could be coming to a park near you more than a thousand people show up that wants to eat dinner outside. Wearing only white -- -- bears he showed up -- was wearing the same -- -- We're -- the colors the clothes -- the whole point. On -- picturesque New York night this leads to band of Brothers and sisters gather in an instant to look me in. Fabulous. So elegant and sending it and it's. Green -- neon -- I mean really. Yeah. I -- so he's getting. And -- -- man. The price for the most part it's who know kind of sick it is far as the what you know. Thinking deeply and -- the last minute to tell you. It's almost -- -- asserts this stuff was. -- -- -- And I wouldn't know what. Needless to say -- it in full motion the use of these -- a strange and wondrous -- agent for those walking by not in the them. -- -- And one. This was the first time anything like this has been tried in the US he started 43 years ago in -- Please on this -- about he was Henrique past years -- has voted in. -- god and so. And by the time they got in just to get smaller so we went into the living space with the winds that the present like investor and -- told -- Even reporters covering the event ET OP to dress code -- wouldn't -- -- Tonight. Because. Sports do it's about wet -- but I try to drive a. -- literally was like back but there's little time to steal over the strict codes because after a few hours of -- picnicking in cleaning. At. Dean have all -- all disappear it's gone this passes it came. There are pleased to take is national but for now it's just a distant memory. In want. It beat -- -- the earth I'm John Berman for Nightline in do you.

This transcript has been automatically generated and may not be 100% accurate.

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