Reports the Times:
Groups of four or more people under 21 years old and unaccompanied by a parent are not allowed to linger, lest they become a large unruly group or even an impromptu gathering known as a flash mob.
The policy—enforced more heavily at some times than others, and obviously impossible to circumvent—came about after a number of incidents involving unruly teens, including a flash mob at Buffalo Wild Wings after which a knife fight broke out.
Though obviously peevish, impractical, and counterintuitive, these new restrictions seem to me to be something of a gift to Brooklyn teenagers, who live in the capital of the world, after all, and really ought to be hanging out somewhere cooler than the mall, it's not like this is fucking South Portland, Maine, where the Maine Mall's slogan, "Where Else Would You Go?", is hideously, tauntingly appropriate.