anyone noticed stuff about: Smart Mobs (or Flash Mobs) ?
"New Yorkers are using e-mail to coordinate "inexplicable mobs" — huge crowds that materialize in public places and suddenly dissipate 10 minutes later."
Some links:
cheesebikini (see also his link to Matrix Mobs re-enacting matrix movie scenes in Japan - v.funny)
smartmobs
[Note: straying into the realm of linking to likely A-List Bloggers... tread carefully !]