If a bunch of people invite you to take a ride in a limousine, don't get in. Even if they offer you candy.
Seriously, though, sometimes they don't offer candy: sometimes four guys force you into their car and try to rape you. And then word spreads on facebook, and bloggers send out requests asking if anybody who might have been witness to the incident, in Itaewon at 3:30 AM, or who has some info about it, could get in touch and help us track down the kinds of creeps and scuzzmuffins who would do something disgusting like that.
More at this facebook page. If anybody knows more about this, there's contact info on the page.