Rich kids who dress like punks and hang out at the sunken area around the Harvard Square T station. They can seem threatening until you realize that they have to run home to mommy at eight o'clock because it's a school night. Many are also much more friendly and conscientious than they seem.
They've been known to harass the crazy old guy who shouts Bible passages on Saturday nights with Teletubbies to break his concentration, but it never works. His resolve is just too good.