"That'd explain the cops, then," says Eartha, who's just spotted the NYPD members running after the thing with their weapons drawn. "Where the hell is Dr. Stantz?"

The answer is depressingly simple: this is New York, at Christmastime, in the middle of one of the most heavily overcrowded shopping districts around. Unless Ecto wants to dump her crew and transform so she can step over the crowds herself, she's stuck trying to get people out of her way.