[ClearCase_guy]

For some young people this may be "fun", but make no mistake, this can be a tactic used by people who want to cause serious damage.

Just imagine a flash mob event where 500 teens decided to run up the stairs inside the World Trade center on the morning of 9/11. What a hoot that would have been, huh?

The organizers of such a flash mob could be Muslim, but the participants could be stupid Manhattan teens looking for a good time.

[Mad Dawgg]

Yeah it could be abused but also it can really be a good bit of fun:

This is one of the better ones I have seen: Antwerp Flash Mob

This one is very elaborate with lots of folks shooting the action and they had to get someone at the station to broadcast the music.

[NEMDF]

I guess I am surprised that there was not looting and vandalism involved, as well as the fighting.